Question posed by IT repair tech. Client's netbook. Acer Aspire E11 (ES1-111M-C3CP) Celeron N2840, 2GB HD, 32GB eMMC soldered on to board (non-removable).
Corrupt Windows won't boot, suspect Win10 or 8.1 64bit. Successfully booted to Xubuntu 17.10 by pendrive, backed up data to other pendrive (thankfully).
Since then, have not been able to adjust any settings in UEFI, except date and time.
Also ignores all attempts to boot from other device. Cannot take off UEFI mode to Legacy. Won't boot off UEFI external devs (Win10 home 1709 pendrive 64bit created by MS media creation tool, Win10 DVD via USB DVD drive). Won't boot off legacy either (uNetBootIn created Xubuntu 17.10). Also won't allow me to change non-boot options such as touchpad mode (basic / advanced). When F10 pressed to save and exit, changes don't persist after immedaite reboot. Consistently trying to boot off corrupted Windows.
Have tried removing and reseating CMOS battery. Don't think the CMOS battery is flat, the date and time stay correct all the while.
Seems similar to this guy, what we have in common is the symptoms and that it was 17.10 ubuntu of some flavour (though he's installed Ubuntu 17.10, I ran Xubuntu off pendrive). https://askubuntu.com/questions/970451/unable-to-save-bios-options-after-ubuntu-17-10-upgrade
Something in latest Ubuntu crippling EFI settings, blocking future changes? If I'm correct, I have no idea how to resolve, especially as storage soldered on to board, cannot be read in any other computer. Suggestions?