Hello, my chromebooks battery recently completely died out on me (only works while plugged in) I decided to restore stock firmware so i did that while it being completely plugged in. It never unplugged and stock firmware was installed successfully. Now when I try to Recover the Chromebook it says “Chrome OS is missing or damaged.” Please remove all connected devices and start recovery. I have tried various USB flash drives including a San Disk USB-C drive, and a generic Micro SD to USB adapted, none of these work and it is just stuck on Chrome OS is missing or damaged. Keep in mind I MUST keep the charger plugged in in order for me to power on my Chromebook
Perhaps the only option is get a new battery then do the recovery.
OP probably chucked that chromebook in the trash by now, but for anyone else having this problem, stuck at “Please remove all connected devices and start recovery” press and hold the refresh button when powering up.