Is there a way to figure out which TPM bypass I used years ago to install Windows 11? (Trying to update to 24H2)

Understanding and Managing TPM Bypasses for Windows 11 Upgrades: A Guide for Experienced Users

Introduction

As Windows enthusiasts and advanced users, many of us have experimented with various methods to install or upgrade to Windows 11, especially during its early release phase when hardware compatibility was a concern. Over time, these methods often involve bypassing certain system requirements such as Trusted Platform Module (TPM) 2.0. However, as Microsoft continues to update Windows 11 with new feature updates like 24H2, it’s essential to ensure your system is properly aligned with the official requirements and that previous workarounds do not interfere with updates.

Identifying Your Past TPM Bypass Method

If you’re looking to update your system to the latest Windows 11 version and suspect that a previous TPM bypass might be causing issues, the first step is to determine what method was used originally. Given the variety of bypass techniques—modifying registry keys, using specific installation media, registry hacks, or third-party tools—it can be challenging to recall which one was employed years ago.

While there isn’t a straightforward way to directly identify which bypass method was used after the fact, you can start by examining your current system configuration:

Check your system’s BIOS/UEFI settings: Ensure TPM 2.0 is enabled. If it is disabled, enabling it could resolve compatibility issues.
Review registry modifications: Some bypass methods rely on registry edits. Use the Registry Editor (regedit) and look for keys related to Windows 11 requirements, such as those under HKEY_LOCAL_MACHINE\SYSTEM\Setup\MoSetup. Specifically, check for keys like AllowUpgradesWithUnsupportedTPMOrCPU or similar entries that might have been added.
Investigate installed patches or scripts: If you recall running any scripts or third-party tools, review your system logs or saved scripts to jog your memory.

Enabling TPM 2.0 and Preparing for Update

In your case, it’s confirmed that your system has TPM 2.0 hardware, but it is not enabled in the BIOS. Enabling TPM in your BIOS is a fundamental step to meet Windows 11 requirements and to avoid needing bypasses. Once enabled, your system will be more aligned with Microsoft’s standards, reducing potential complications during updates.

Checking Compatibility and Update Options

If Windows Update isn’t showing the 24H2 update, consider the following troubleshooting steps: