Board 01 21 B6 E1 E2 Er - Intel Desktop

Since "21-B6-E1-E2" is just a regulatory marking, you need the

Intel boards have a recovery mode:

Your sequence appears to represent a boot attempt that made significant progress through early CPU and memory initialization before failing during the system wake-up phase. Each two-digit code marks a major milestone. intel desktop board 01 21 b6 e1 e2 er