Background: ASUS BIOS files come packaged in capsule files with the file extension .CAP. I also have a .310 file extension that can be read like a capsule file and used to flash a BIOS as such. My goal is to “unlock” the BIOS and create a BIOS file that will not be blocked from being uploaded onto the ROM. Currently, I cannot upload said modified BIOS because I cannot modify the date to a date that follows the date of the old BIOS file on the ROM.

I’ve found 2 techniques to edit such BIOS files:

1. Hex dump manual parsing
2. Third-party App utility

Hex-dump manual parsing

I know there is a technique where you look at the hex dump and look for a section of spacer/padding hex code and then using a hex editor to convert it to plaintext.

App/Utility Editor

I’ve used an app that let’s you change the context of the code and create a new file, but it does not change the date of said file. When trying to upload the new file, the BIOS does not accept older files with older dates than the existing BIOS that’s loaded on the ROM.

I understand the proprietary nature of the file extension limits knowledge. Also, I understand the issue with wrongly tampering with a BIOS file, which could brick the computer. Aware that it can be quite easy to brick a BIOS if one does not know what one is doing, so it’s not the best thing to try on a live motherboard. But, I am looking for advanced answers.