Working BIOS for Dell Wistron board 19709-1, which also carries the code J85JT$LA, apparently a Dell board part identifier, in an 8.67 MB RAR archive. No laptop model is given. Wistron's five-digit dash-suffix numbering identifies it as the ODM. After extraction, confirm the image size matches the SPI flash chip, then write it with an external programmer to restore a board with corrupted firmware. Read and keep the original chip contents, and check the PCB number before flashing.
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 @schematiclaptopramkushwaha. 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 →