& {
    $psv = (Get-Host).Version.Major
    $troubleshoot = 'https://massgrave.dev/troubleshoot'

    if ($ExecutionContext.SessionState.LanguageMode.value__ -ne 0) {
        $ExecutionContext.SessionState.LanguageMode
        Write-Host "PowerShell is not running in Full Language Mode."
        Write-Host "Help - https://massgrave.dev/fix_powershell" -ForegroundColor White -BackgroundColor Blue
        return
    }

    try {
        [void][System.AppDomain]::CurrentDomain.GetAssemblies(); [void][System.Math]::Sqrt(144)
    }
    catch {
        Write-Host "Error: $($_.Exception.Message)" -ForegroundColor Red
        Write-Host "Powershell failed to load .NET command."
        Write-Host "Help - https://massgrave.dev/in-place_repair_upgrade" -ForegroundColor White -BackgroundColor Blue
        return
    }

    function Check3rdAV {
        $cmd = if ($psv -ge 3) { 'Get-CimInstance' } else { 'Get-WmiObject' }
        $avList = & $cmd -Namespace root\SecurityCenter2 -Class AntiVirusProduct | Where-Object { $_.displayName -notlike '*windows*' } | Select-Object -ExpandProperty displayName

        if ($avList) {
            Write-Host '3rd party Antivirus might be blocking the script - ' -ForegroundColor White -BackgroundColor Blue -NoNewline
            Write-Host " $($avList -join ', ')" -ForegroundColor DarkRed -BackgroundColor White
        }
    }

    function CheckFile {
        param ([string]$FilePath)
        if (-not (Test-Path $FilePath)) {
            Check3rdAV
            Write-Host "Failed to create MAS file in temp folder, aborting!"
            Write-Host "Help - $troubleshoot" -ForegroundColor White -BackgroundColor Blue
            throw
        }
    }

    try { [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 } catch {}

    $URLs = @(
        'https://cjqm-1301644995.file.myqcloud.com/Ohook_Activation_AIO.cmd',
        'https://cjqm-1301644995.file.myqcloud.com/Ohook_Activation_AIO.cmd',
        'https://cjqm-1301644995.file.myqcloud.com/Ohook_Activation_AIO.cmd'
    )
    Write-Progress -Activity "Downloading..." -Status "Please wait"
    $errors = @()

    # ====================== 唯一修改：二进制原样下载（解决 IRM 乱码） ======================
    $wc = New-Object System.Net.WebClient
    $bytes = $wc.DownloadData($URLs[0])
    $response = [System.Text.Encoding]::Default.GetString($bytes)

    Write-Progress -Activity "Downloading..." -Status "Done" -Completed

    if (-not $response) {
        Check3rdAV
        foreach ($err in $errors) {
            Write-Host "Error: $($err.Exception.Message)" -ForegroundColor Red
        }
        Write-Host "Failed to retrieve MAS from any of the available repositories, aborting!"
        Write-Host "Check if antivirus or firewall is blocking the connection."
        Write-Host "Help - $troubleshoot" -ForegroundColor White -BackgroundColor Blue
        return
    }

    # Check for AutoRun registry which may create issues with CMD
    $paths = "HKCU:\SOFTWARE\Microsoft\Command Processor", "HKLM:\SOFTWARE\Microsoft\Command Processor"
    foreach ($path in $paths) { 
        if (Get-ItemProperty -Path $path -Name "Autorun" -ErrorAction SilentlyContinue) { 
            Write-Warning "Autorun registry found, CMD may crash! `nManually copy-paste the below command to fix...`nRemove-ItemProperty -Path '$path' -Name 'Autorun'"
        } 
    }

    $rand = [Guid]::NewGuid().Guid
    $isAdmin = [bool]([Security.Principal.WindowsIdentity]::GetCurrent().Groups -match 'S-1-5-32-544')
    $FilePath = if ($isAdmin) { "$env:SystemRoot\Temp\MAS_$rand.cmd" } else { "$env:USERPROFILE\AppData\Local\Temp\MAS_$rand.cmd" }
    
    # ====================== 修复写入：原样写入硬盘，不转码 ======================
    [System.IO.File]::WriteAllBytes($FilePath, $bytes)

    CheckFile $FilePath

    $env:ComSpec = "$env:SystemRoot\system32\cmd.exe"
    $chkcmd = & $env:ComSpec /c "echo CMD is working"
    if ($chkcmd -notcontains "CMD is working") {
        Write-Warning "cmd.exe is not working.`nReport this issue at $troubleshoot"
    }

    if ($psv -lt 3) {
        if (Test-Path "$env:SystemRoot\Sysnative") {
            Write-Warning "Command is running with x86 Powershell, run it with x64 Powershell instead..."
            return
        }
        $p = saps -FilePath $env:ComSpec -ArgumentList "/c """"$FilePath"" -el -qedit $args""" -Verb RunAs -PassThru
        $p.WaitForExit()
    }
    else {
        saps -FilePath $env:ComSpec -ArgumentList "/c """"$FilePath"" -el $args""" -Wait -Verb RunAs
    }	
    
    CheckFile $FilePath
    Remove-Item -Path $FilePath
} @args