Never use a BIOS file from another PC, even if it also has a Pegatron 2a99 board. The revisions differ (e.g., 2a99 1.0 vs. 2a99 2.1). Flashing the wrong BIOS can brick your motherboard.
The Pegatron Corporation 2a99 is a relic of the Vista era—robust but obsolete. You can spend hours wrestling with driver signatures, legacy NVIDIA installers, and Realtek conflicts. However, if you have a 2a99-based system, here is the final verdict: