BIOS image for the ASUS X550Z and X550ZE laptops, mainboard revision 2.0, marked as a 4 MB build and packed in a 3.01 MB RAR. The 4 MB label points to a 32 Mbit SPI flash. Technicians write it with an external programmer when the laptop powers up with no image or hangs after a failed update. Board revisions can differ in firmware, so check that the PCB reads Rev 2.0 and that the installed chip really is 4 MB. Save the original contents before erasing, and verify the write afterwards.
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 →