Have a success story or a bricked board? Consult specialized forums like Badcaps.net or Win-Raid for advanced Pegatron SPI flash programming using hardware programmers (CH341A). But that is a story for another, much more technical article.
When in doubt, accept that your Pegatron motherboard is a relic of the OEM economy—functional, unglamorous, and best left untouched. Upgrade your RAM or SSD instead; the performance gain will dwarf any theoretical benefit from a BIOS tweak.