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

    Fault : A machine is broken by the latest update and needs it removed
    Fix   : Remove the update from WinRE on a machine that will not boot
    Source: https://jbtecwiz.com/support/win-rollback-update

    Run as     : Windows Recovery Environment
    Expect     : 30 minutes
    Risk       : medium
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    Windows no longer starts. Two failed boots normally bring WinRE up on
    its own.

    HOW TO UNDO IT
    The package can be reinstalled from the Microsoft Update Catalog once
    the cause is known.

    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 '  A machine is broken by the latest update and needs it removed' -ForegroundColor White
Write-Host '  Remove the update from WinRE on a machine that will not boot' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: medium   Reversible   30 minutes'
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 -- power off during boot twice, or boot installation media and choose Repair your computer.' -Manual

Invoke-Step -Number 2 -Do 'Try the built-in option first: Troubleshoot -> Advanced options -> Uninstall Updates -> Uninstall latest quality update.' -Why 'This does exactly what the DISM commands below do, without needing the package name, and it handles combined SSU+LCU packages correctly.' -Manual

Invoke-Step -Number 3 -Do 'If that fails, open Troubleshoot -> Command Prompt and find the Windows drive letter.' -Command {
    cmd.exe /c 'diskpart & list volume & exit'
}

Invoke-Step -Number 4 -Do 'List the packages installed on the offline image, newest last.' -Command {
    cmd.exe /c 'DISM /Image:D:\ /Get-Packages /Format:Table'
}

Invoke-Step -Number 5 -Do 'Remove the most recent one.' -Command {
    cmd.exe /c 'DISM /Image:D:\ /Remove-Package /PackageName:Package_for_RollupFix~31bf3856ad364e35~amd64~~19041.3803.1.9'
}

Invoke-Step -Number 6 -Do 'Exit and restart.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'Windows boots to the sign-in screen.' '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-rollback-update' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: The package can be reinstalled from the Microsoft Update Catalog once the cause is known.' 'DarkGray'
Write-Rule