Raw 1 MB BIOS binary for the Acer Aspire 4420, built on the BIWA mainboard with board number 06237-3M. Numbers in this form are typical of Wistron, which manufactured many Acer notebooks of that period. A 1 MB image matches an 8 Mbit SPI or LPC flash chip, the usual size on older laptops. Technicians write such a file directly to the chip with a programmer to revive a board left dead by a bad flash. Back up the original contents first and check that the 06237-3M marking appears on your PCB.
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 @afsbiosfree. Enginerys does not host this file.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →