Hey rosies_99,
No. This BIOS was created specifically to resolve the low battery beep so it should not have any advese effects. BIOS updating is pretty common. I have never seen a BIOS update cause an issue unless it was inadvertently interrupted by the user unplugging the computer or something similar. As long as you let it "do its thing" and you allow it to restart on its own without pressing the power button or unplugging it, it should go smoothly. Some people are leery of such a "big" update but the only time it's a "big" deal is when it is interrupted.
Thank you for your appreciation :)