Firmware Utility Script failure

Yesterday I tried updating the firmware on my EDGAR machine and the updating script failed.
Option chosen was “Install/Update UEFI (Full ROM) Firmware”
The machine is still powered up and running.
I can provide the flashrom.log as well if needed.
(wrong line removed)

mrchromebox firmware-util diagnostic report
Sat Nov 23 22:11:35 EST 2024

[deviceDesc]
Acer Chromebook 14 (CB3-431)

[deviceCpuType.Name]
Intel Braswell

[fwDate]
06/15/2024

[hasUEFIoption]
true

[isUnsupported]
false

[device]
edgar

[firmwareType]
Full ROM / UEFI

[_hwid]
EDGAR

[lsb-release]
DISTRIB_ID=LinuxMint
DISTRIB_RELEASE=22
DISTRIB_CODENAME=wilma
DISTRIB_DESCRIPTION=“Linux Mint 22 Wilma”

[boardName]
EDGAR

[dmidecode.device]
edgar

[swWp]
disabled

[wpEnabled]
false

[fwVer]
MrChromebox-2405.0

[deviceCpuType.id]
BSW

An attempt to fix by restoring the old bios with the command below (as suggested by MrChromebox)
sudo /tmp/flashrom -p internal --ifd -i bios -w /tmp/bios.bin -N
appeared successful, but now the system is bricked after power off.

Probably flashing a guaranteed good bios file would have been a better approach, so if anybody gets in this situation, ignore the backup file and use a freshly downloaded and verified one with the command above!

I will attempt to unbrick by reprogramming the flash after disassembly but I don’t have the 1.8V adapter or the clips needed, so here it ends for now.