Intel Desktop Board 01 21 B6 E1 E2 Er

— it is almost certainly a stuck or erroneous readout from a malfunctioning board, typically requiring BIOS recovery or hardware replacement.

Intel does not provide drivers for these boards for Windows 10 or 11. Here is how you get them working:

Common hardware features found on boards carrying this identification include: : Support for DDR3 SDRAM via two or more DIMM slots. : Typically includes at least one PCI Express 2.0 x16 slot for dedicated graphics. Connectivity : Integrated Ethernet (RJ-45) USB 2.0/3.0