let’s figure that out. can you pastebin the output from (sudo) dmidecode? May also need you to download or build the coreboot cbmem utility to pull the firmware boot log
edit: cbmem download: https://mrchromebox.tech/files/util/cbmem.tar.gz
extract, then run: sudo ./cbmem -1c > cbmem.log
and pastebin the full output