Zipped BIOS binary named J2CN46WW, a version-style code that follows Lenovo's BIOS naming convention ending in WW, though the model itself is not stated. About 6.5 MB compressed, the image should be checked for size after extracting so it matches the SPI chip. It is used to restore a non-booting board by writing the chip with an external programmer. Verify the BIOS ID corresponds to the board, and dump the original chip first to preserve serial numbers and other system data.
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 @vinafix_bios. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →