Intel Desktop Board 01 21 B6 E1 E2 Er May 2026

You cannot just put any Core 2 Duo in these boards.

Many Intel desktop board labels have format: 01 21 B6 E1 E2 ER as a human-readable hex + checksum.

Developed content:

Decoding Intel Board Serial Number Format

Example: 01 21 B6 E1 E2 ER

This format appears on older Intel Desktop Boards (DG, DH, DQ series).

To find exact board model:

Developed content – Example spec sheet snippet:

Intel Desktop Board – Identification String intel desktop board 01 21 b6 e1 e2 er

| Field | Value | Meaning |
|-------|-------|---------|
| PFA | 01 | Primary fab – Penang |
| YW | 21 | Week 21 |
| Board trace | B6 | PCB revision B6 |
| Config | E1 | Embedded controller version E1 |
| Security | E2 | TPM firmware E2 |
| BIOS lock | ER | Extended recovery mode enabled |

Boards with ER in identifier may require recovery BIOS update via jumper.

Searching community forums (Tom’s Hardware, Intel Communities, Reddit) reveals exactly “01 21 b6 e1 e2 er” reported by users with:

The consensus: The board loops or halts at e1 or e2, then shows er. This usually indicates: You cannot just put any Core 2 Duo in these boards

Given Intel stopped making desktop boards in 2013, these boards are now legacy. If er persists after above steps, the board likely has a failed component (PCH, VRM, or BIOS chip corruption beyond recovery).

Intel boards from this era are notorious for failing electrolytic capacitors.

Status: System Management Bus (SMBus) setup
Meaning: E1 is an OEM-specific code (not standard Phoenix or Award). On Intel boards, E1 usually corresponds to initializing the SMBus, which communicates with voltage regulators, thermal sensors, and RAM SPD EEPROMs. A hang at E1 points to a short on the SMBus clock or data line.

If stuck at E1: