This board generally supports UEFI, which is necessary for booting from drives larger than 2TB and running Windows 11 (though the CPU might not be officially supported by Microsoft).
Locate the CLR_CMOS jumper near the battery. Move the jumper from pins 1-2 to 2-3 for roughly 10 seconds while the power is disconnected to reset BIOS settings. Acer Ipimb-ar Rev 1.02a Manual