KVS
Kernel Version Switcher
kxtz (kxtzownsu), OlyB
Website Writeup GitHub Discord Source

Requirements

  • Access to Chromebook Recovery Utility
  • Compatible peripheral, such as a USB drive or SD card

    • About

    Changes the tpm_kernver value to any version.

    This works using the hexdumps of 0x1008 (kernver TPM index) and tpmc to write the hexdumps of your selected kernver to the 0x1008 TPM index.

    YOU MUST BE UNENROLLED TO USE KVS! ANY ISSUES REPORTED RELATING TO BEING ENROLLED WHILE TRYING TO USE THIS WILL GET CLOSED IMMEDIATELY

    Usage

    Download your shim from kxtz' shim mirror

    After downloading, flash your USB/SD with the file, I recommend Chrome Recovery Utility.

    FAQ

    Q: Will this brick my device?

    A: No, KVS has no way to permanantly brick / hard brick a device. At most, it will make ChromeOS stop booting, but you will still be able to boot shims to recover the kernver index.

    Q: What kernvers are there?

    A: There are 4,294,967,296 possible kernel versions (0x00000000 - 0xFFFFFFFF)

    Q: What versions can I downgrade to with kernver _

    A: Heres what versions you can downgrade to with each official kernver

    kernver 0: any

    kernver 1: any

    kernver 2: 112 - 119

    kernver 3: 120 - 124

    kernver 4: 125 - 131

    kernver 5: 132 - latest

    Q: What is the difference between kernver 0 and kernver 1?

    A: literally none, its just cool to see

    Credits

    kxtzownsu - Writing KVS

    OlyB - Helping me with the shim builder, most of the shim builder wouldn't exist without him.

    Google - Writing the tpmc command