BIOS archive for the Lenovo ThinkPad E550 and E550C, board NM-A221 revision 1.0 with the AITE1 project code. The RAR contains firmware for reprogramming the SPI flash with a hardware programmer such as a CH341A, used on boards that will not post after a failed update or chip corruption. LCFC, Lenovo's in-house ODM, uses the NM-xxxx numbering. Match the board revision printed on the PCB, save a read of the original chip first, and compare the image size with the chip capacity before writing.
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 →