FYI I am on the phone with support and apparently this new firmware does not play well with the NVMe drives.
I am having to create a live boot drive first, I cannot boot the laptop.
Sounds like he wants me to try a previous version of the firmware.
UPDATE: @MrChromebox turns out support has informed the lasted version doesn’t work with the NVMe drives, so you have to revert back to a previous version. I did this with support, so now the auto switching to a headset or other external speaker is not automatic. Still must be done in settings manually.