Information about MCM and ACM (Mercedes SFTP MP4 EURO6 trucks ECU).

There are released many different versions of MCM and ACM ECU's.
- MCM
- MCM2
- MCM2.1 not locked
- MCM2.1 locked (from 2016/4 - up 2019/04) (HW: D2; HW: D3)
- MCM2.1 locked (from 2019/04 - 2021/06) (HW: D4)
- MCM2.1 locked (from 2021/06 - up today) (HW: D5)
- ACM2
- ACM2.1 not locked
- ACM2.1 locked (from 2016/04 - up 2019/06) (HW: D2.x; HW: D3)
- ACM2.1 locked (from 2019/06 - up today) (HW: D4)

Truck Explorer Licenses coverage for a read/write function with VEI and Direct Connect 2 tool:

1. License ACM/MCM BSL:

2. License MCM2:

3. License MCM2.1:

4. License ACM2/ACM2.1:

The deference between OBD, BSL and DC modes:

OBD mode: is a software mode by diagnostic port OBDII.
Advantage: Fast - 5 minutes.; No need to disconnect or open ECU.
Disadvantage: Could not read damaged ECU.

BSL mode: is a Boot Strap Loader mode. (Safe mode for ECU).
Advantage: Could read/write damaged ECU.
Disadvantage: Slow mode. 30 min to read or write

DC mode: is a normal software mode.
Advantage: Fast - 5 minutes.; Reads MCM2.1 locked and ACM2.1 locked. No need to open ECU.
Disadvantage: Could not read damaged ECU.

How you could damage ECU:
- if you prevent write operation;
- if you disconnect DC2 at write operation;
- if your power supply (or truck battery) is a very bad condition;

Use these functions at your own risk!