Firmware dump taken from an ASUS X409FB main board revision 2.0, which the name reports as tested and fully working.

Combined BIOS and EC firmware package for the ASUS X409FB laptop mainboard, revision 2.0, in a RAR archive of about 5.19 MB.

ASUS schematic covering the X409FA, X409FB, X409FJ and X409FL models, provided as a 2.96 MB PDF.

Schematic in PDF, packed in RAR, covering the ASUS X409FA, X409FB, X409FJ and X409FL, variants that differ mainly in graphics configuration.

A 5.32 MB zip for the ASUS X509FA notebook, EJ056T configuration, which the name links to the X409FB mainboard, revision 2.0.

An ASUS BIOS image for the Y4200F and X409FB laptop board revision 2.0, packed as RAR and described in the name as fully working.

BIOS image shared by the ASUS X509FJ and X409FB laptops, board revision 2.0, marked as OK.

BIOS image for the ASUS X409FB mainboard, revision 2.0, with the Intel Management Engine region cleaned, which is described as a tested working dump.

Working BIOS for the ASUS Y4200F, Y5200F and X409FB laptops, board revision 2.0, with an 8th-generation Core i5-8265U.

Working BIOS for the ASUS X409FB rev 2.0 mainboard in the variant with an NVIDIA MX110 graphics chip, N16V-GMR1-S-A2. The name claims it was tested and works fully.

BIOS archive for an X409FB laptop mainboard at revision 2.0, marked with FL8700FJ, a code that looks like an ASUS board identifier, packed as a 5.11 MB RAR.