ASUS ZenBook UX303UB BIOS archive, 3.59 MB in RAR form, labelled AS.206, which looks like an ASUS BIOS version number for this model. A dump like this is used to restore corrupted firmware by programming the SPI flash directly with an external programmer. Save the original chip contents before erasing, since the backup preserves serial and configuration data. Confirm that the image length equals the chip capacity before writing.
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 →