Read-only check
The app reads the regions where an unlock leaves its trace. Nothing is written and nothing on the car changes.
BMW DME unlock — is my ECU locked?
BMWs built after June 2020 have an engine control unit locked behind a different security protocol. On those cars nobody — us included — can write to the ECU until it has been unlocked. The good news: finding out where your car stands costs nothing.
What exactly is the lock?
From mid-2020 BMW added a further verification layer on the DME bootloader side. A locked ECU rejects write requests arriving over OBD at the signature check. How well the calibration was built makes no difference — the car simply refuses it.
The procedure that opens it is known in the trade as an unlock, and it usually requires the ECU to be removed from the car and worked on a bench. Specialist firms do this; MOSTUNED does not provide the unlock service itself.
Our work starts after the unlock: once the ECU is open, we prepare the calibration, sign it against your VIN, and you write it with the app.
How the app determines unlock status
The moment it connects, read-only, writing nothing.
Provider detection
Where the values read back are not stock, they identify which unlock provider opened the car.
Compatibility verdict
We can work with FEMTO, ForceCrc32, BtldRsaChecksum and BmwExplorer style unlocks.
Free
There is no charge for this check. If the answer is no, you find out before you buy.
One caveat
On some cars the relevant region is read-protected and returns 0xFF. Detection is then inconclusive — the car may still be unlocked, and we work it out together.
What if it is locked?
We point you towards an unlock. Once that is done, we pick things up on the calibration side.
An unlock is target-specific — the detail people miss
A commonly overlooked point: an unlock is performed with a target in mind. The same ECU can be opened differently for different tuning platforms. So "my car is unlocked" does not automatically mean every platform can write to it.
That is precisely what the app's check exists to separate. It tells you not whether the car is open, but whether it is open in a way we can write to. Which is why we ask you to run the check before buying anything.
Unlock questions
My car is pre-2020. Do I still need an unlock?
Usually not — the lock arrived with post-June-2020 production. Running the app's check is still the only way to be certain.
Do you perform the unlock?
No. We work on the calibration and flashing side. If your car is locked we point you towards an unlock service.
Can an unlock damage my car?
Because it involves removing the ECU and working on it at a bench, the competence of the firm doing it is what matters. That stage is not under our control, so we cannot warrant it.
Can I return to stock after an unlock?
On the calibration side yes — we back up the original file. But the unlock itself is a permanent change to the ECU, and reverting a calibration does not revert it.
Is there a charge for the check?
No. The unlock check is free, and we would rather you ran it before buying.
Related pages
- Remote BMW tuning — what happens after the unlock
- B48 tuning — supported engine
- Datalog analysis — a check independent of any remap
- Disclaimer — risk and limits of liability
Contact
Get in touch
WhatsApp: +90 547 470 40 40
Monday–Saturday 09:00–20:00 (UTC+3) · Remote service, wherever you are
Request a quote
Send your model, engine code, any hardware modifications and what you want out of the car; we will work out the right package together.