#Requires -Version 5.1
<#
    JbTecWiz Support Centre -- generated fix script

    Fault : STOP 0x000000EF -- CRITICAL_PROCESS_DIED
    Fix   : Break the boot loop from WinRE
    Source: https://jbtecwiz.com/support/win-0xef

    Run as     : Windows Recovery Environment
    Expect     : 1 hour
    Risk       : medium
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    The machine loops before reaching a desktop.

    HOW TO UNDO IT
    bcdedit /store D:\Boot\BCD /set {default} recoveryenabled Yes puts
    automatic recovery back once the machine is healthy.

    This script walks the fix one step at a time and asks before each
    one. Steps with no command are things you do yourself -- it prints
    those and waits. Run with -DryRun to print without executing.

    --------------------------------------------------------------------
    NO WARRANTY - USE AT YOUR OWN RISK

    This script is provided by JbTecWiz as-is and with no warranty of any
    kind, express or implied. You run it entirely at your own risk.

    JbTecWiz accepts no liability for any loss or damage arising from its
    use, including but not limited to data loss, downtime, or configuration
    changes that turn out to be wrong for your system.

    You are responsible for reading this script before running it, for
    satisfying yourself that it suits the machine in front of you, and for
    having a working backup first. Some steps cannot be undone.
    --------------------------------------------------------------------
#>

[CmdletBinding()]
param(
    # Print every step and command without running anything.
    [switch]$DryRun,
    # Do not ask before each step. Read the script first if you use this.
    [switch]$Unattended
)

$ErrorActionPreference = 'Stop'
$script:Failed = 0

function Write-Rule { param([string]$Text)
    Write-Host ''
    Write-Host ('-' * 70) -ForegroundColor DarkGray
    if ($Text) { Write-Host $Text -ForegroundColor Cyan }
}

function Show-Prose { param([string]$Text, [string]$Colour = "Gray")
    if (-not $Text) { return }
    $words = $Text -split "\s+"; $line = "  "
    foreach ($w in $words) {
        if (($line.Length + $w.Length) -gt 74) { Write-Host $line -ForegroundColor $Colour; $line = "  " }
        $line += "$w "
    }
    if ($line.Trim()) { Write-Host $line -ForegroundColor $Colour }
}

function Invoke-Step {
    param(
        [int]$Number, [string]$Do, [string]$Why,
        [scriptblock]$Command, [switch]$Manual, [string]$Shell = "powershell"
    )
    Write-Rule "  Step $Number of 6"
    Show-Prose $Do "White"
    if ($Why) { Write-Host ""; Show-Prose $Why "DarkGray" }

    if ($Manual) {
        Write-Host ''
        Write-Host '  -> Do this yourself, then press Enter to carry on.' -ForegroundColor Yellow
        if (-not $Unattended -and -not $DryRun) { [void](Read-Host) }
        return
    }

    Write-Host ''
    foreach ($l in ($Command.ToString().Trim() -split "`n")) {
        Write-Host ("    " + $l.Trim()) -ForegroundColor Green
    }
    Write-Host ''

    if ($DryRun) { Write-Host "  (dry run -- not executed)" -ForegroundColor DarkGray; return }
    if (-not $Unattended) {
        $a = Read-Host "  Run this step? [Y]es / [S]kip / [Q]uit"
        if ($a -match "^[Qq]") { Write-Host "  Stopped at your request."; exit 0 }
        if ($a -match "^[Ss]") { Write-Host "  Skipped." -ForegroundColor DarkGray; return }
    }
    try { & $Command }
    catch {
        $script:Failed++
        Write-Host ("  Step $Number failed: " + $_.Exception.Message) -ForegroundColor Red
        Show-Prose "The rest of the fix may depend on this. Read the write-up before carrying on." "Red"
        if (-not $Unattended) {
            $c = Read-Host "  Carry on anyway? [y/N]"
            if ($c -notmatch "^[Yy]") { exit 1 }
        }
    }
}

Write-Rule
Write-Host '  STOP 0x000000EF -- CRITICAL_PROCESS_DIED' -ForegroundColor White
Write-Host '  Break the boot loop from WinRE' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: medium   Reversible   1 hour'
Write-Host ''
Show-Prose 'No warranty. Use at your own risk - JbTecWiz accepts no liability. Read it before you run it, and have a backup.' 'DarkYellow'
Write-Rule

if (-not $Unattended -and -not $DryRun) {
    $go = Read-Host '  Ready? [y/N]'
    if ($go -notmatch "^[Yy]") { Write-Host "  Nothing was changed."; exit 0 }
}

Invoke-Step -Number 1 -Do 'Reach WinRE and open Command Prompt. Identify the Windows volume with diskpart.' -Manual

Invoke-Step -Number 2 -Do 'Check the disk first.' -Command {
    cmd.exe /c 'chkdsk D: /f /r'
}

Invoke-Step -Number 3 -Do 'Run the offline system file check.' -Command {
    cmd.exe /c 'sfc /scannow /offbootdir=D:\ /offwindir=D:\Windows'
}

Invoke-Step -Number 4 -Do 'Revert any pending update transaction, which is a frequent cause of the loop.' -Command {
    cmd.exe /c 'DISM /Image:D:\ /Cleanup-Image /RevertPendingActions'
}

Invoke-Step -Number 5 -Do 'If it still loops, disable automatic restart so the bugcheck stays on screen long enough to read which process died.' -Why 'This stops WinRE hijacking every boot, which otherwise hides the actual error text you need.' -Command {
    cmd.exe /c 'bcdedit /store D:\Boot\BCD /set {default} recoveryenabled No & bcdedit /store D:\Boot\BCD /set {default} bootstatuspolicy IgnoreAllFailures'
}

Invoke-Step -Number 6 -Do 'As a last resort before rebuilding, use System Restore from WinRE if a restore point predates the fault.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'The machine boots to sign-in.' 'White'

Write-Rule
if ($script:Failed -gt 0) {
    Write-Host ("  Finished with " + $script:Failed + " failed step(s).") -ForegroundColor Yellow
    Show-Prose 'Read the full write-up at https://jbtecwiz.com/support/win-0xef' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: bcdedit /store D:\Boot\BCD /set {default} recoveryenabled Yes puts automatic recovery back once the machine is healthy.' 'DarkGray'
Write-Rule