Nope do not know any way to easily mod or replace a genuine Intel BIOS.
Just my opinion: Intel boards after they decided to solder the eeproms became bastard boards locked to what ever Intel wanted to release for a bios. Using those odd Intel SMT flash proms made it near impossible to convert to socketed for experimentation. They also messed with the flash upgrades so no one could extract a good .bin from their bios updates as they purposely designed the upgrade to just upgrade specific modules within the main bios.
and yes have a few Intel boards.....
Check the mainstream TX chipset boards from Asus, Gigabyte, and etc and they used socketed roms which could easily be replaced, modded or externally programmed...but not Intel.
OK, end of my Intel boards thoughts as they are POS when it come to bios stuff 😁

TX chipset can only cache 64MB. So far, so bad...
Regarding the BIOS I also, unfortunately, can't help any further.

Horun wrote on 2024-09-10, 04:53:

Nope do not know any way to easily mod or replace a genuine Intel BIOS.

At bootup it identifies ifself as a Phoenix BIOS 4.0 Release 6.0, if that makes as difference.

The BIOS is also in a very annoying flat FlashPath chip that cannot be socketed. I don't know how I would recover from a bad flash in this case, since it wouldn't fit into my programmer.

Kahenraz wrote on 2024-09-10, 07:11:

I don't know how I would recover from a bad flash in this case, since it wouldn't fit into my programmer.

Intel boards from this era have a "recovery mode" jumper that boots in a headless mode (without display) and reads a BIOS image (in Intel's stupid .BIO/.BI1/.BI2/etc. format) from the floppy drive to re-flash the ROM chip. I believe it also beeps to indicate progress since you don't have a working display on this mode.

If the recovery mode is also screwed then you would have to de-solder the chip and connect it (or a new chip) to the programmer by using some kind of custom adapter. But you need a full BIOS image to flash, I'm not sure if it's possible to reconstruct one from the BIOS updates provided by Intel.

Some of Intels boards were used in Compaqs which sometimes offered a newer or better BIOS than Intel did. Other than that if you have an Intel made board you are at the mercy of what Intel released AFAIK.
I have a few Intel boards thru socket 1155 and they all have bios limitations compared to other manufactures (Asus, Gigi, MSI, etc)

There is NO Mr.BIOS for AN430TX soo no alternative for Intel stock BIOS.

Babasha wrote on 2024-09-11, 07:41:

There is NO Mr.BIOS for AN430TX soo no alternative for Intel stock BIOS.

There is an OEM Packard Bell BIOS. So there is an alternative, just not necessarily a better one 😉