# ==================================================
# THIẾT LẬP HIỂN THỊ TIẾNG VIỆT CÓ DẤU (UTF-8)
# ==================================================
[Console]::OutputEncoding = [System.Text.Encoding]::UTF8
[Console]::InputEncoding = [System.Text.Encoding]::UTF8
chcp 65001 > $null

$host.ui.RawUI.WindowTitle = "ITSO Windows Checker 2.6"

# =========================
# KIEM TRA QUYEN ADMIN
# =========================
$isAdmin = ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)
if (-not $isAdmin) {
    Clear-Host
    Write-Host "==================================================" -ForegroundColor Red
    Write-Host "  [CANH BAO LOI] THIEU QUYEN QUAN TRI VIEN" -ForegroundColor Red
    Write-Host "==================================================" -ForegroundColor Red
    Write-Host "`nTool nay can quyen Administrator de doc/ghi cac " -ForegroundColor Red
    Write-Host "Service he thong va truy xuat BIOS.`n" -ForegroundColor Red
    Write-Host "Vui lòng bấm vào nút tìm kiếm, gỡ từ khóa PowerShell, " -ForegroundColor Red
    Write-Host " tìm mục Windows PowerSell, nhấp chuột phải và chọn Run As Administator`n" -ForegroundColor Red
    pause
    exit
}

# =========================
# LAY THONG TIN HE THONG
# =========================
$script:OS_NAME = (Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion" -ErrorAction SilentlyContinue).ProductName
$script:OS_BUILD = (Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion" -ErrorAction SilentlyContinue).CurrentBuild

# XU LY LOI HIENTHI WINDOWS 11 CUA MICROSOFT
if ([int]$script:OS_BUILD -ge 22000) {
    $script:OS_NAME = $script:OS_NAME -replace "Windows 10", "Windows 11"
}

if ($env:PROCESSOR_ARCHITECTURE -eq "AMD64") {
    $script:OS_ARCH = "64-bit"
} else {
    $script:OS_ARCH = "32-bit"
}

# =========================
# HÀM GIẢI MÃ FULL KEY (GIỐNG SHOWKEYPLUS)
# =========================
function Get-WindowsFullKey {
    try {
        $regKey = Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion" -Name "DigitalProductId" -ErrorAction Stop
        if ($null -eq $regKey.DigitalProductId) { return "KHONG_TIM_THAY" }

        $hexData = $regKey.DigitalProductId[52..66]
        $chars = "BCDFGHJKMPQRTVWXY2346789"
        $isWin8 = ($hexData[14] -band 1) -ne 0
        $hexData[14] = ($hexData[14] -band 254) -bor ($isWin8 -band 1)
        
        $key = ""
        $last = 0
        for ($i = 24; $i -ge 0; $i--) {
            $current = 0
            for ($j = 14; $j -ge 0; $j--) {
                $current = ($current * 256) + $hexData[$j]
                $hexData[$j] = [math]::Truncate($current / 24)
                $current = $current % 24
            }
            $key = $chars[$current] + $key
            $last = $current
        }
        
        if ($isWin8) {
            $keypart1 = $key.Substring(1, $last)
            $keypart2 = $key.Substring($last + 1)
            $key = $keypart1 + "N" + $keypart2
        }
        
        if ($key.Length -eq 25) {
            return "$($key.Substring(0,5))-$($key.Substring(5,5))-$($key.Substring(10,5))-$($key.Substring(15,5))-$($key.Substring(20,5))"
        }
        return "KHONG_TIM_THAY"
    } catch {
        return "KHONG_TIM_THAY"
    }
}

# =========================
# CÁC HÀM CHỨC NĂNG CHÍNH
# =========================

function Show-Main {
    Clear-Host
    $Host.UI.RawUI.ForegroundColor = "Cyan"
    
    $sys_date = (Get-Date).ToString('dd/MM/yyyy')
    $sys_time = (Get-Date).ToString('HH:mm:ss')

    Write-Host "=================================================="
    Write-Host "        CONG CU KIEM TRA BAN QUYEN WINDOWS"
    Write-Host "    Phat trien boi Tin hoc Nguyen Tai - Phien ban 2.6"
    Write-Host "        Cap nhat: 15/06/2026 - https://itso.vn"
    Write-Host "=================================================="
    Write-Host "    - He dieu hanh   : $($script:OS_NAME) ($($script:OS_ARCH))"
    Write-Host "    - Build          : $($script:OS_BUILD)"
    Write-Host "==================================================`n"
    
    Write-Host " Cong cu giup:"
    Write-Host "    - Kiem tra tinh hop phap cua Windows dang kich hoat"
    Write-Host "    - Phat hien cong cu crack windows trai phep (KMS, KMS38, MAS, HWID)"
    Write-Host "    - Go bo key kich hoat trai phep tren may"
    Write-Host "    - Kiem tra key goc an trong BIOS (OEM tu nha may)"
    Write-Host "    - Kich hoat Windows bang key an trong BIOS"
    Write-Host "    - Kiem tra tinh hop le cua key Doanh nghiep (MAK)"
    Write-Host "    - Mua ban quyen Windows "
    Write-Host "==================================================`n"
    
    Write-Host " MENU:"
    Write-Host "    [1] Kiem tra tinh hop phap cua Windows dang kich hoat"
    Write-Host "    [2] Kiem tra va khoi phuc Key goc tu BIOS (Neu co)"
    Write-Host "    [3] Go bo key va xoa crack (Dua ve nguyen trang)"
    Write-Host "    [4] Kiem tra cap nhat phan mem"
    Write-Host "    [5] Cach hoat dong cua chuong trinh"
    Write-Host "    [6] Mua ban quyen Windows "
    Write-Host "    [7] Thoat`n"
    
    $mainchoice = Read-Host "Chon chuc nang"

    switch ($mainchoice) {
        "1" { Invoke-PreCheck }
        "2" { Invoke-RestoreOEM }
        "3" { Invoke-Remove }
        "4" { Invoke-Buy }
        "5" { Invoke-HowItWorks }
        "6" { Invoke-Mua }
        "7" { exit }
        default { Show-Main }
    }
}

function Invoke-PreCheck {
    Clear-Host
    $Host.UI.RawUI.ForegroundColor = "Yellow"
    Write-Host "=================================================="
    Write-Host "[CANH BAO]: Cong cu nay ho tro quet cac cong cu CRACK co phat sinh MA DOC va VIRUS."
    Write-Host "==================================================`n"
    Write-Host "    [1] Tiep tuc"
    Write-Host "    [2] Quay lai`n"
    
    $precheck_choice = Read-Host "Chon"
    if ($precheck_choice -eq "1") { Invoke-Check }
    elseif ($precheck_choice -eq "2") { Show-Main }
    else { Invoke-PreCheck }
}

function Invoke-Check {
    Clear-Host
    $Host.UI.RawUI.ForegroundColor = "Cyan"
    Write-Host "Dang kiem tra ban quyen va truy xuat BIOS, vui long doi...`n"

    $tempDli = "$env:TEMP\itso_license.txt"
    $tempXpr = "$env:TEMP\itso_xpr.txt"
    
    cscript //Nologo $env:windir\system32\slmgr.vbs /dli | Out-File $tempDli -Encoding Default
    cscript //Nologo $env:windir\system32\slmgr.vbs /xpr | Out-File $tempXpr -Encoding Default

    $dliContent = Get-Content $tempDli -Raw
    $xprContent = Get-Content $tempXpr -Raw

    $script:PK = "XXXXX"
    $pkMatch = $dliContent | Select-String -Pattern "Partial Product Key:\s*(.*)" -AllMatches
    if ($pkMatch.Matches.Count -gt 0) {
        $script:PK = $pkMatch.Matches[0].Groups[1].Value.Trim()
    }

 # LẤY FULL KEY QUA HÀM GIẢI MÃ VÀ LỌC LỖI BBBBB
    $script:FULL_KEY = Get-WindowsFullKey
    
    if ($script:FULL_KEY -eq "KHONG_TIM_THAY" -or $script:FULL_KEY -eq "BBBBB-BBBBB-BBBBB-BBBBB-BBBBB") {
        if ($script:PK -ne "XXXXX" -and $script:PK -ne "") {
            $script:FULL_KEY = "*****-*****-*****-*****-" + $script:PK
        } else {
            $script:FULL_KEY = "CHUA_CAI_DAT_KEY"
        }
    }

    # BẮT TRẠNG THÁI KHÔNG CÓ KEY NGAY TỪ ĐẦU
    if ($script:FULL_KEY -eq "CHUA_CAI_DAT_KEY" -or $script:PK -eq "XXXXX") {
        Invoke-NoKey
        return
    }

    $script:ACT = "CHUA KICH HOAT"
    if ($xprContent -match "permanently activated") {
        $script:ACT = "DA KICH HOAT"
    }
    
    # --- LẤY LOẠI KÊNH BẢN QUYỀN (CHANNEL) ---
    $script:CHANNEL = "KHONG_XAC_DINH"
    if ($dliContent -match "RETAIL") {
        $script:CHANNEL = "RETAIL"
    } elseif ($dliContent -match "OEM") {
        $script:CHANNEL = "OEM"
    } elseif ($dliContent -match "VOLUME_MAK" -or $dliContent -match "MAK") {
        $script:CHANNEL = "VOLUME MAK (Doanh nghiep)"
    } elseif ($dliContent -match "VOLUME_KMS" -or $dliContent -match "KMS") {
        $script:CHANNEL = "VOLUME KMS"
    }
    


    # --- QUET BIOS KEY BANG POWERSHELL ---
    $script:BIOS_KEY = "KHONG_TIM_THAY"
    $biosWmi = Get-CimInstance -Query 'select * from SoftwareLicensingService' -ErrorAction SilentlyContinue
    if ($biosWmi -and -not [string]::IsNullOrWhiteSpace($biosWmi.OA3xOriginalProductKey)) {
        $script:BIOS_KEY = $biosWmi.OA3xOriginalProductKey
    }

    # --- QUET CRACK ---
    if ($dliContent -match "VOLUME_KMSCLIENT" -or $dliContent -match "KMS" -or $dliContent -match "GVLK") {
        $script:CRACK_REASON = "Dung key Volume KMS hoac bi can thiep"
        Invoke-CrackFound; return
    }

    if ($xprContent -match "2038") {
        $script:CRACK_REASON = "Phat hien crack KMS38"
        Invoke-CrackFound; return
    }

    if (Get-Service -Name "AutoKMS" -ErrorAction SilentlyContinue) {
        $script:CRACK_REASON = "Phat hien Service giam sat AutoKMS"
        Invoke-CrackFound; return
    }

    if (Get-Service -Name "KMSELDI" -ErrorAction SilentlyContinue) {
        $script:CRACK_REASON = "Phat hien Service KMSELDI"
        Invoke-CrackFound; return
    }

    if (Get-Service -Name "SppExtComObjHook" -ErrorAction SilentlyContinue) {
        $script:CRACK_REASON = "Phat hien Service be khoa SppExtComObjHook"
        Invoke-CrackFound; return
    }

    if (Get-ScheduledTask -TaskName "AutoKMS" -ErrorAction SilentlyContinue) {
        $script:CRACK_REASON = "Phat hien tac vu AutoKMS chay ngam"
        Invoke-CrackFound; return
    }

    $hostsFile = "$env:windir\System32\drivers\etc\hosts"
    if (Test-Path $hostsFile) {
        $hostsContent = Get-Content $hostsFile -Raw -ErrorAction SilentlyContinue
        if ($hostsContent -match "activation\.sls\.microsoft\.com\s*127\.0\.0\.1" -and $hostsContent -match "microsoft") {
            $script:CRACK_REASON = "File Hosts da bi sua de chan server Microsoft"
            Invoke-CrackFound; return
        }
    }

    # Thiet lap co canh bao Key HWID (Key chung)
    $script:HWID_WARN = "0"
    $hwidKeys = @(
        "3V66T", "T83GX", "YKHCF", "TXYCV", # Pro
        "8HVX7", "233PK", "8XC4K",          # Enterprise
        "WFG99", "6F4BT", "YTDFH",          # Home
        "2YT43", "H8Q99", "7CFBY", "VCFB2", # Edu / Workstations
        "J8JXD", "8HV2C", "PDQGT", "YY74H"  # Other / LTSC
    )
    if ($hwidKeys -contains $script:PK) {
        $script:HWID_WARN = "1"
    }

    # --- QUET MAK ---
    if ($dliContent -match "MAK") {
        Invoke-MakKey; return
    }

    # --- QUET HOP LE KET HOP BIOS ---
    if ($dliContent -match "OEM" -or $dliContent -match "RETAIL") {
        if ($script:HWID_WARN -eq "1") {
            if ($script:BIOS_KEY -eq "KHONG_TIM_THAY") {
                $script:CRACK_REASON = "Phat hien dung Digital License HWID (MAS)"
                Invoke-CrackFound; return
            } else {
                $script:CRACK_REASON = "Dung HWID de kich hoat Windows dung KHONG DUNG phien ban mac dinh"
                Invoke-CrackFound; return
            }
        } else {
            Invoke-Legal; return
        }
    }

    Invoke-Unknown
}

function Invoke-MakKey {
    Clear-Host
    $Host.UI.RawUI.ForegroundColor = "Yellow"
    Write-Host "=================================================="
    Write-Host "          PHAT HIEN KEY VOLUME: MAK"
    Write-Host "==================================================`n"
    Write-Host "Trang thai: DA KICH HOAT - Key Doanh nghiep`n"
    Write-Host "Key tren Windows : $($script:FULL_KEY)"
    Write-Host "Key goc tren BIOS: $($script:BIOS_KEY)`n"
    Write-Host "[GIAI THICH LICH SU]:"
    Write-Host "May ban dang su dung Key MAK. Day KHONG phai la crack,"
    Write-Host "ma la loai key cap phep so luong lon cho doanh nghiep."
    Write-Host "Thuong gap khi cai ban ghost hoac may thanh ly du an.`n"

    if ($script:BIOS_KEY -ne "KHONG_TIM_THAY") {
        $Host.UI.RawUI.ForegroundColor = "Cyan"
        Write-Host "[!!! QUAN TRONG !!!]"
        Write-Host "May nay co san BAN QUYEN GOC [$($script:BIOS_KEY)] an trong Main."
        Write-Host "Ban nen dung chuc nang [2] o menu chinh de go bo key MAK"
        Write-Host "va ep nhan lai key xin nha san xuat cho on dinh tuyet doi.`n"
        Write-Host "=================================================="
        Write-Host "LUU Y: CHUC NANG NAY CHI HOAT DONG NEU PHIEN BAN WIN TRUNG KHOP PHIEN BAN DI KEM MAY `n"
        Write-Host "Neu bam [1] nhung khong cap nhat duoc thi nguyen nhan do GHOST WIN hoac O CUNG da duoc thay extreme tu truoc."
        Write-Host "May se nhan dung ban quyen neu cai lai win bang bo cai chuan ISO cua Microsoft"
        Write-Host "==================================================`n"
    } else {
        Write-Host "Khong tim thay key goc cua may. Co the la key bat hop phap "
        Write-Host "hoac key doanh nghiep bi tuon ra thi truong. Ban van co the su dung"
        Write-Host "key MAK nay binh thuong cho den khi bi Microsoft quet."
        Write-Host "Tuy nhien neu ban khong xac dinh duoc nguon goc cua key nay, ban nen go ra"
        Write-Host "va cai lai ban quyen moi`n"
        Write-Host "=================================================="
        Write-Host "[KHUYEN NGHI]: Cac cong cu crack luon tiem an rui ro cho du lieu."
        Write-Host "Ban nen su dung ban quyen chinh hang de co trai nghiem on dinh va bao mat hon!"
        Write-Host "=================================================="
    }
    pause
    Show-Main
}

function Invoke-Legal {
    Clear-Host
    if ($script:ACT -eq "CHUA KICH HOAT") {
        $Host.UI.RawUI.ForegroundColor = "Yellow"
        Write-Host "=================================================="
        Write-Host "                KET QUA KIEM TRA BAN QUYEN"
        Write-Host "==================================================`n"
        Write-Host "Trang thai ban quyen: CO KEY NHUNG CHUA KICH HOAT"
        Write-Host "Trang thai kich hoat: $($script:ACT)"
        Write-Host "Loai ban quyen      : $($script:CHANNEL)`n"
        Write-Host "[CANH BAO]: He thong da nhan key nhung CHUA KICH HOAT thanh cong."
        Write-Host "Nguyen nhan pho bien: Key Retail da bi gioi han, hoac do loi mang.`n"
    } else {
        $Host.UI.RawUI.ForegroundColor = "Green"
        Write-Host "=================================================="
        Write-Host "                KET QUA KIEM TRA BAN QUYEN"
        Write-Host "==================================================`n"
        Write-Host "Trang thai ban quyen: HOP LE"
        Write-Host "Trang thai kich hoat: $($script:ACT)"
        Write-Host "Loai ban quyen      : $($script:CHANNEL)`n"
    }

    Write-Host "Key tren Windows : $($script:FULL_KEY)"
    Write-Host "Key goc tren BIOS: $($script:BIOS_KEY)`n"

    if ($script:BIOS_KEY -ne "KHONG_TIM_THAY") {
        $Host.UI.RawUI.ForegroundColor = "Cyan"
        Write-Host "-> CHUC MUNG! May nay co san ban quyen NGUYEN GOC tu nha san xuat.`n"
        Write-Host "Ban quyen nay duoc tich hop san trong bios cua may."
        Write-Host "Ban khong can mua ban quyen neu khong co nhu cau.`n"
    }

    if ($script:HWID_WARN -eq "1") {
        $Host.UI.RawUI.ForegroundColor = "Yellow"
        Write-Host "[! THONG BAO !]"
        Write-Host "May nay dang su dung Key Generic [Key chung] cua Microsoft,"
        Write-Host "nhung vi co Key goc tren BIOS nen he thong danh gia la HOP LE.`n"
    }

    Write-Host "=================================================="
    pause
    Show-Main
}

function Invoke-CrackFound {
    Clear-Host
    $Host.UI.RawUI.ForegroundColor = "Red"
    Write-Host "=================================================="
    Write-Host "         PHAT HIEN WINDOWS DUNG CRACK / TRAI PHEP"
    Write-Host "==================================================`n"
    Write-Host "Trang thai: KHONG HOP LE - CRACK"
    Write-Host "Nguyen nhan: $($script:CRACK_REASON)`n"
    Write-Host "Key tren Windows : $($script:FULL_KEY)"
    Write-Host "Key goc tren BIOS: $($script:BIOS_KEY)`n"

    if ($script:BIOS_KEY -ne "KHONG_TIM_THAY") {
        $Host.UI.RawUI.ForegroundColor = "Yellow"
        Write-Host "[!!! QUAN TRONG !!!]"
        Write-Host "May cua ban thuc chat CO BAN QUYEN GOC an trong mainboard."
        Write-Host "Nhung hien tai he dieu hanh lai dang kich hoat bang key khong hop le."
        Write-Host "Hay chon chuc nang [2] o menu de khoi phuc lai key goc.`n"
    }

    Write-Host "    [1] Khong lam gi - quay lai menu"
    Write-Host "    [2] Go bo crack va khac phuc he thong"
    Write-Host "    [3] Thoat`n"
    Write-Host "=================================================="
    Write-Host "[KHUYEN NGHI]: Cac cong cu crack luon tiem an rui ro cho du lieu."
    Write-Host "Ban nen su dung ban quyen chinh hang de co trai nghiem on dinh va bao mat hon!"
    Write-Host "==================================================`n"

    $crackchoice = Read-Host "Chon"
    if ($crackchoice -eq "1") { Show-Main }
    elseif ($crackchoice -eq "2") { Invoke-Remove }
    elseif ($crackchoice -eq "3") { exit }
    else { Invoke-CrackFound }
}

function Invoke-Remove {
    Clear-Host
    $Host.UI.RawUI.ForegroundColor = "Yellow"
    Write-Host "=================================================="
    Write-Host "         GO BO KEY VA LAM SACH HE THONG"
    Write-Host "==================================================`n"
    Write-Host "[CANH BAO]: Cong cu nay ho tro quet cac cong cu CRACK co phat sinh MA DOC va VIRUS`n"
    Write-Host "Neu nhu ban xac dinh may cua ban dang dung Windows CRACK va muon go key"
    Write-Host "(khong can qua buoc check) thi hay lua chon:`n"
    Write-Host "    [1] Go KEY, khoi phuc tinh toan ven cua Windows"
    Write-Host "    [2] Thoat`n"
    Write-Host "=================================================="
    Write-Host ". Neu ban la DOANH NGHIEP chua tung mua ban quyen Windows"
    Write-Host "  thi nen chu dong GO BO de tranh vi pham luat SHTT"
    Write-Host "=================================================="

    $remove_choice = Read-Host "Nhap lua chon cua ban"
    
    if ($remove_choice -eq "2") { Show-Main }
    elseif ($remove_choice -eq "1") {
       Write-Host "`nDang tien hanh go bo key va xoa crack (neu co), vui long doi..."

# 1. Dừng các dịch vụ bản quyền gốc để tránh lỗi khi can thiệp
Stop-Service -Name sppsvc -Force -ErrorAction SilentlyContinue
Stop-Service -Name osppsvc -Force -ErrorAction SilentlyContinue

# 2. Xóa Key và thông tin KMS bằng slmgr
cscript //Nologo $env:windir\system32\slmgr.vbs /upk | Out-Null
cscript //Nologo $env:windir\system32\slmgr.vbs /cpky | Out-Null
cscript //Nologo $env:windir\system32\slmgr.vbs /ckms | Out-Null
cscript //Nologo $env:windir\system32\slmgr.vbs /rearm | Out-Null

# 3. Quét và diệt các Service của tool Crack
$crackServices = @("AutoKMS", "KMSELDI", "SppExtComObjHook", "KMSAuto")
foreach ($svc in $crackServices) {
    Stop-Service -Name $svc -Force -ErrorAction SilentlyContinue
    sc.exe delete $svc | Out-Null
}

# 4. Quét và xóa các Tác vụ chạy ngầm (Scheduled Tasks) của tool Crack
$crackTasks = @("AutoKMS", "AutoPico Daily Restart", "KMSAutoNet", "SvcRestartTask")
foreach ($task in $crackTasks) {
    Unregister-ScheduledTask -TaskName $task -Confirm:$false -ErrorAction SilentlyContinue
}

# 5. Dọn dẹp Registry KMS Policy
$sppPolicyPath = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\CurrentVersion\Software Protection Platform"
if (Test-Path $sppPolicyPath) {
    Remove-ItemProperty -Path $sppPolicyPath -Name "KeyManagementServiceName" -ErrorAction SilentlyContinue
    Remove-ItemProperty -Path $sppPolicyPath -Name "KeyManagementServicePort" -ErrorAction SilentlyContinue
}

# 6. Khôi phục file Hosts
$hostsPath = "$env:windir\System32\drivers\etc\hosts"
if (Test-Path $hostsPath) {
    Set-ItemProperty -Path $hostsPath -Name IsReadOnly -Value $false -ErrorAction SilentlyContinue
}
"# Default Hosts File`r`n127.0.0.1 localhost" | Out-File -FilePath $hostsPath -Encoding ascii
        
        $Host.UI.RawUI.ForegroundColor = "Green"
        Write-Host "`nDa hoan tat go bo key va lam sach he thong!"
        Write-Host "Vui long KHOI DONG LAI may de ap dung thay doi.`n"
        Write-Host "=================================================="
        Write-Host "[KHUYEN NGHI]: Cac cong cu crack luon tiem an rui ro cho du lieu."
        Write-Host "Ban nen su dung ban quyen chinh hang de co trai nghiem on dinh va bao mat hon!"
        Write-Host "==================================================`n"
        pause
        Show-Main
    } else {
        Invoke-Remove
    }
}

function Invoke-RestoreOEM {
    Clear-Host
    $Host.UI.RawUI.ForegroundColor = "Yellow"
    Write-Host "=================================================="
    Write-Host "        KHOI PHUC KEY BAN QUYEN GOC TU BIOS"
    Write-Host "==================================================`n"
    Write-Host "[THONG BAO]: Tinh nang nay danh cho khach hang muon xoa bo key hien tai "
    Write-Host "va tra lai key goc duoc nha san xuat tich hop tren bios.`n"
    Write-Host "    [1] Tiep tuc "
    Write-Host "    [2] Quay lai `n"
    Write-Host "=================================================="
    Write-Host "LUU Y: CHUC NANG NAY CHI HOAT DONG NEU PHIEN BAN WIN TRUNG KHOP PHIEN BAN DI KEM MAY `n"
    Write-Host "Neu bam [1] nhung khong cap nhat duoc thi nguyen nhan do GHOST WIN hoac O CUNG da duoc thay the tu truoc."
    Write-Host "May se nhan dung ban quyen neu cai lai win bang bo cai chuan ISO cua Microsoft"
    Write-Host "==================================================`n"

    $restore_choice = Read-Host "Nhap lua chon cua ban"
    
    if ($restore_choice -eq "2") { Show-Main }
    elseif ($restore_choice -eq "1") {
        $TEMP_BIOS = "KHONG_TIM_THAY"
        $biosWmi = Get-CimInstance -Query 'select * from SoftwareLicensingService' -ErrorAction SilentlyContinue
        if ($biosWmi -and -not [string]::IsNullOrWhiteSpace($biosWmi.OA3xOriginalProductKey)) {
            $TEMP_BIOS = $biosWmi.OA3xOriginalProductKey
        }

        if ($TEMP_BIOS -eq "KHONG_TIM_THAY") {
            $Host.UI.RawUI.ForegroundColor = "Red"
            Write-Host "Rat tiec! Mainboard cua may nay KHONG duoc tich hop san"
            Write-Host "ban quyen Windows tu nha san xuat."
            Write-Host "Khong the thuc hien khoi phuc.`n"
            pause
            Show-Main
        } else {
            Write-Host "`nPhat hien Key goc: $TEMP_BIOS"
            Write-Host "Dang tien hanh xoa key cu va nhap key goc, vui long doi...`n"

            cscript //Nologo $env:windir\system32\slmgr.vbs /upk | Out-Null
            cscript //Nologo $env:windir\system32\slmgr.vbs /cpky | Out-Null
            cscript //Nologo $env:windir\system32\slmgr.vbs /ipk $TEMP_BIOS | Out-Null

            Write-Host "Dang ket noi den may chu Microsoft de kich hoat..."
            cscript //Nologo $env:windir\system32\slmgr.vbs /ato | Out-Null

            $Host.UI.RawUI.ForegroundColor = "Green"
            Write-Host "`n=================================================="
            Write-Host "DA HOAN TAT! "
            Write-Host "Vui long dung chuc nang [1] de kiem tra lai trang thai."
            Write-Host "=================================================="
            pause
            Show-Main
        }
    } else {
        Invoke-RestoreOEM
    }
}

function Invoke-Buy {
    Clear-Host
    Write-Host "Dang tai thong tin, vui long doi..."
    Start-Process "https://itso.vn/iwc"
    Start-Sleep -Seconds 2
    Show-Main
}

function Invoke-Mua {
    Clear-Host
    Write-Host "Dang tai thong tin, vui long doi..."
    Start-Process "https://itso.vn/iwcbuy"
    Start-Sleep -Seconds 2
    Show-Main
}

function Invoke-HowItWorks {
    Clear-Host
    $Host.UI.RawUI.ForegroundColor = "Cyan"
    Write-Host "=================================================="
    Write-Host "                  CACH THUC HOAT DONG"
    Write-Host "==================================================`n"
    Write-Host "Tool ITSO hoat dong dua tren 4 buoc kiem tra an toan:`n"
    Write-Host "1. QUET CHIP BIOS (Mainboard):"
    Write-Host "   Dung lenh he thong PowerShell de truy xuat vao phan cung,"
    Write-Host "   tim kiem Key ban quyen chuan xuat xuong (OEM Key).`n"
    Write-Host "2. PHAN TICH GIAY PHEP WINDOWS:"
    Write-Host "   Goi script cua Microsoft (slmgr.vbs) de doc trang"
    Write-Host "   thai hien tai: La Retail, OEM, MAK hay KMS.`n"
    Write-Host "3. QUET TIM DAU VET CRACK/HACK:"
    Write-Host "   - Quet Task Scheduler va Services xem co tool an."
    Write-Host "   - Kiem tra file Hosts co bi sua de chan Microsoft."
    Write-Host "   - Check cac loai KMS 180 ngay, KMS38, HWID/MAS.`n"
    Write-Host "4. KHOI PHUC HE THONG / GO BO KEY:"
    Write-Host "   Go bo sach se file/service rac cua tool crack, dua"
    Write-Host "   file Hosts ve mac dinh hoac xoa hoan toan Key dang dung.`n"
    Write-Host "* Tool khong chua ma doc, chay 100% bang lenh he thong!`n"
    Write-Host "=================================================="
    pause
    Show-Main
}

function Invoke-Unknown {
    Clear-Host
    $Host.UI.RawUI.ForegroundColor = "Yellow"
    Write-Host "=================================================="
    Write-Host "                KHONG XAC DINH DUOC LOAI KEY"
    Write-Host "==================================================`n"
    Write-Host "Key tren Windows : $($script:FULL_KEY)"
    Write-Host "Key goc tren BIOS: $($script:BIOS_KEY)`n"
    pause
    Show-Main
}

# =========================
# KHỞI CHẠY MENU CHÍNH
# =========================
Show-Main