Working BIOS image for the HP Elite x2 G4 detachable, identified by the product number 8QT55AV, reported as fully tested. The name does not give the board number, so confirm compatibility from the PCB markings before use. Flash it to the SPI chip with an external programmer to revive a corrupted firmware. Keep a full backup of the original chip, because HP stores serial number and system information there. Also check that the extracted image size matches the chip capacity.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @biosarchive. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →