Depending on the age of the system, I'm going to highly doubt it has dual BIOS chips onboard, especially considering it's a Gateway. Dual BIOS works by when the computer fails to boot off of the primary BIOS, it falls back on the secondary chip in case of corruption or improper settings.
The jumper on a single BIOS chip will do the same thing as removing the battery. And like you also said some dual BIOS systems will re-flash the primary chip. Not all - depends on how they were designed.
The jumper on a single BIOS chip will do the same thing as removing the battery. And like you also said some dual BIOS systems will re-flash the primary chip. Not all - depends on how they were designed.