Firmware set for a Lenovo Flex 3 board marked BM5455 revision 1.3, combining the system BIOS and the embedded controller (EC) firmware for an 8 MB flash chip. Having both images lets you recover boards where a corrupted EC prevents power-on or charging, not only BIOS faults. Flash the files with an SPI programmer after checking that the chip on your board really is 8 MB, since a mismatched image will not fit. Save a backup of the original contents before writing anything.
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 →