Firmware for the ASUS X551MA-RCLN03, described in the name as for the in-built single chip, which most likely means a single onboard SPI flash holding the whole image.

Boardview archive for the ASUS X551MA, marked as version 2.0, with the word boardview misspelled in the name.

BIOS package for the ASUS X551MA laptop, labelled as tested by its preparer. The name does not state a board revision, so check the motherboard markings for the same…