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

    Fault : 0x800f0922 -- update fails, System Reserved partition full or no route to Microsoft
    Fix   : Clear the network obstruction and repair .NET
    Source: https://jbtecwiz.com/support/win-0x800f0922

    Run as     : Elevated PowerShell
    Expect     : 25 minutes
    Risk       : low
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    A VPN or proxy is present, or a .NET update is the one failing.

    HOW TO UNDO IT
    Restore the proxy with netsh winhttp set proxy if other traffic needed
    it.

    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 5"
    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 '  0x800f0922 -- update fails, System Reserved partition full or no route to Microsoft' -ForegroundColor White
Write-Host '  Clear the network obstruction and repair .NET' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: low   Reversible   25 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 'Disconnect any VPN client completely, not just the tunnel -- some leave a route in place.' -Why 'The update transaction has to reach Microsoft''s servers to validate; a split-tunnel that captures those routes fails it with this code.' -Manual

Invoke-Step -Number 2 -Do 'Check the WinHTTP proxy, which is what the update service uses rather than the browser''s setting.' -Command {
    cmd.exe /c 'netsh winhttp show proxy'
}

Invoke-Step -Number 3 -Do 'Clear it if it should not be there.' -Command {
    cmd.exe /c 'netsh winhttp reset proxy'
}

Invoke-Step -Number 4 -Do 'For a .NET failure, repair the installed version with Microsoft''s .NET Repair Tool before retrying.' -Manual

Invoke-Step -Number 5 -Do 'Reset the update cache and retry.' -Command {
    Stop-Service wuauserv, bits -Force
    Rename-Item C:\Windows\SoftwareDistribution SoftwareDistribution.old
    Start-Service bits, wuauserv
}

Write-Rule "  Confirm it worked"
Show-Prose 'The update installs and the history shows Succeeded.' 'White'
Write-Host ''
if (-not $DryRun) {
    Get-WinEvent -LogName 'Setup' -MaxEvents 20 | Format-Table TimeCreated, Id, Message -AutoSize
}

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-0x800f0922' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Restore the proxy with netsh winhttp set proxy if other traffic needed it.' 'DarkGray'
Write-Rule