![Quote](images/misc/quote_icon.png)
Originally Posted by
Blacky
The 2022 ECMs have an updated boot block that enforces a digital signature check that cannot be bypassed.
The 2021 ECMs have a boot block that contained a "bug" that could be exploited to bypass the digital signature - Cummins fixed that bug in the 2022 boot block update.
So no, you can't use 2021 ECM to gain access to a 2022 ECM, the only way would be to change the boot block in the 2022 back to the 2021 boot block, but you can't do that until/unless you supply the correct digital signature (or bypass it, which cannot be done).
Warning: Getting your 2021 ECM flashed at a dealer can update the boot block to the 2022 boot block thus rendering the ECM no longer tunable.
Regards
Paul