Firmware package for the ASUS GA503QS, a ROG Zephyrus G15 model, with board revision 2.3 given in the name. The file name does not say whether it holds a full SPI dump or the EC firmware, so unpack the RAR and check the image size against your flash chip. A full dump is written to the BIOS chip with a programmer after you save a backup of the original. Confirm the board revision on the PCB first. A clean dump without the machine's own serial data may need the serial restored afterwards.
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 @skclappybios. 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 →