#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 a running Windows
    Source: https://jbtecwiz.com/support/win-rollback-update

    Run as     : Elevated PowerShell
    Expect     : 20 minutes
    Risk       : medium
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    Windows still starts.

    HOW TO UNDO IT
    Resume updates and let it reinstall once the underlying cause is
    understood.

    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 a running Windows' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: medium   Reversible   20 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 'List what went on recently and when.' -Command {
    Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 10 HotFixID, Description, InstalledOn
}

Invoke-Step -Number 2 -Do 'Try the simple route first.' -Why 'wusa cannot remove a combined SSU+LCU package, which is how most cumulative updates now ship. When it refuses, use DISM below -- that is expected, not a failure.' -Command {
    cmd.exe /c 'wusa.exe /uninstall /kb:5034441 /quiet /norestart'
}

Invoke-Step -Number 3 -Do 'If wusa refuses, find the package name.' -Command {
    DISM /Online /Get-Packages /Format:Table | Select-String 'RollupFix|LanguageFeatures|Package_for'
}

Invoke-Step -Number 4 -Do 'Remove it by package identity.' -Command {
    DISM /Online /Remove-Package /PackageName:Package_for_RollupFix~31bf3856ad364e35~amd64~~19041.3803.1.9
}

Invoke-Step -Number 5 -Do 'Pause updates so it does not reinstall before you have investigated.' -Why 'Without this the machine reinstalls the same update on its next scan and you are back where you started.' -Command {
    Set-ItemProperty 'HKLM:\SOFTWARE\Microsoft\WindowsUpdate\UX\Settings' -Name PauseUpdatesExpiryTime -Value ((Get-Date).AddDays(21).ToUniversalTime().ToString('yyyy-MM-ddTHH:mm:ssZ'))
}

Invoke-Step -Number 6 -Do 'Restart.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'The update is gone and the symptom with it.' 'White'
Write-Host ''
if (-not $DryRun) {
    Get-HotFix -Id KB5034441 -ErrorAction SilentlyContinue
}

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: Resume updates and let it reinstall once the underlying cause is understood.' 'DarkGray'
Write-Rule