Updating bios

[squallseifer]

Hi im using an Xecuter 2 modchip and i plan on upgrading the bios because im using the standard one it came with. Now i am unsure of whether my modchip is flash upgradable because the brand of modchip i am unsure of. It could be a homebrew one, anyway would it be possible to try flashing it with say a 256k bios? Or would i end up buggering the xbox if im unsure of all the info needed?