I made the USB with Etcher, and it only wants to boot from the internal storage and nothing else. my chromebook is Acer Chromebook 315 with board name blorb. i used the mrchromebox tutorial to get coreboot installed. it backed up the previous BIOS image perfectly to a 1GB stick. this might be because im using a SD to USB adapter. i have installed Linux Mint and windows 10 using the same adapter. any recommendations for what to do next?
Create the USB drive with rufus, ventoy or Linux dd. Connect directly if possible.