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

    Fault : BitLocker asks for the recovery key at every boot
    Fix   : Check the TPM itself
    Source: https://jbtecwiz.com/support/win-sec-bitlocker-prompt

    Run as     : Elevated PowerShell
    Expect     : 30 minutes
    Risk       : high
    Reversible : NO -- read the undo note below before running

    WHEN THIS IS THE RIGHT FIX
    Re-sealing does not hold, or the TPM reports a fault.

    HOW TO UNDO IT
    None -- a cleared TPM cannot be restored. The recovery key is the only
    route back in.

    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 '  BitLocker asks for the recovery key at every boot' -ForegroundColor White
Write-Host '  Check the TPM itself' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: high   NOT REVERSIBLE   30 minutes' -ForegroundColor Yellow
Write-Host ''
Show-Prose 'Undo: None -- a cleared TPM cannot be restored. The recovery key is the only route back in.' 'Yellow'
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 'Read the TPM state.' -Command {
    Get-Tpm | Format-List TpmPresent,TpmReady,TpmEnabled,TpmActivated,LockedOut,ManufacturerVersion
}

Invoke-Step -Number 2 -Do 'LockedOut true means too many failed attempts; it clears itself after a timeout, or can be reset with the owner authorisation.' -Manual

Invoke-Step -Number 3 -Do 'Update the TPM firmware from the machine manufacturer if a fault is reported. Suspend BitLocker first -- a TPM firmware update always changes the measurements.' -Manual

Invoke-Step -Number 4 -Do 'Clearing the TPM destroys every key sealed to it. With BitLocker enabled and no recovery key escrowed, that means the data is gone.' -Why 'The Clear-Tpm command is widely suggested for this fault and it is the one action here that can lose the data outright. It is safe only with protection suspended and the recovery key confirmed in hand.' -Command {
    Get-Tpm | Format-List LockoutCount,LockoutMax
}

Invoke-Step -Number 5 -Do 'With BitLocker suspended and the key confirmed, clear the TPM from the firmware settings, then resume BitLocker so it re-seals cleanly.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'Get-Tpm reports TpmReady true, and BitLocker boots without prompting.' '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-sec-bitlocker-prompt' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: None -- a cleared TPM cannot be restored. The recovery key is the only route back in.' 'DarkGray'
Write-Rule