Restore Stock Firmware reports success but device remains on custom Full ROM firmware

[frezerotation]

I tried to restore the stock ChromeOS firmware on my Acer Chromebook 314 (Board name: DROID) using the MrChromebox firmware utility script. The script successfully completed the "Restore Stock Firmware" process and reported success. However, after reboot, the device still boots into the custom Coreboot Full ROM firmware (with the Coreboot logo visible), not the original ChromeOS firmware.

When I run the script again, it still detects that the Full ROM firmware is installed, indicating that the stock firmware was not actually restored despite the success message.

I created a ChromeOS recovery USB using the official Chrome Recovery Utility for my device model and selected it when prompted by the script during the restore process.

Steps to reproduce:

Create a ChromeOS recovery USB for Acer Chromebook 314 (DROID) using official Chrome Recovery Utility.

Run firmware-util.sh (MrChromebox's script).

Select option to restore stock firmware using the ChromeOS recovery USB.

Script completes and reports success.

Reboot device.

Expected result:
Device boots into original ChromeOS firmware, script detects stock firmware installed.

Actual result:
Device boots into Coreboot Full ROM firmware, script detects Full ROM firmware still installed.

Additional info:

Firmware version before restore was custom Full ROM (coreboot_edk2).

Tried multiple USB drives and recovery images.

The "extracting firmware from recovery USB" step does not show any explicit error.

Need help to correctly restore stock firmware.

[MrChromebox]

clearly there is an unhandled error somewhere which we're not seeing. The better option would be to restore from your own backup, the recovery USB option is supposed to be a last resort, not the first option