BIOS archive for an X99HD3 desktop motherboard, board version V1.21, with the name stating a 16 MB image. X99 indicates the Intel X99 platform for LGA2011-3 Xeon and Core processors, common on aftermarket boards. Use it to restore a board with a corrupted or failed BIOS by writing the image to the SPI chip with an external programmer. Check that the version marking on your PCB reads V1.21, verify the chip is 128 Mbit, and back up the existing contents first, since a mismatched image may brick the board.
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 →