Description
BMW & MINI EWS / IMMO Off Service — Instant DME & DDE Immobilizer Delete
Free your BMW or MINI ECU from the immobilizer in seconds. Upload your original read, and our automated patcher removes the EWS/IMMO/CAS link, recalculates the checksums for you, and returns a ready-to-flash file — no hex editor, no manual checksum tools, no back-and-forth over email. Covers the full range of Bosch and Siemens/Continental BMW petrol DMEs plus DDE diesel controllers
Instant and online: no mailing your DME
Many EWS delete services are mail-in: you pull the DME, ship it off, pay $300 or more and wait days for it to come back. With BTT you keep your DME in the car or on your bench.
- $49 per ECU, one license = one patch
- Patched in seconds: upload your read, download the EWS-deleted file
- No shipping, no downtime: flash it back yourself with your own tool
When do you need an EWS delete?
- Swapping in a used or replacement DME/DDE from another car
- Engine swaps and project cars without the original EWS or CAS module
- A faulty EWS/CAS module or lost key sync stopping the car from starting
- Bench testing and ECU repair work
What you get
- ✅ EWS/IMMO/CAS removal
- ✅ Automatic checksum correction on every supported ECU – flash back immediately
- ✅ Instant download — patched in seconds, any tool’s read format accepted
- ✅ Secure, private processing — your file is never stored after download
One license = one patch. Upload, download, flash. Done.
Supported ECUs
All files receive automatic checksum correction:
Type Size (KB) Checksum -------------------------------------- ----------- -------- MS41 24 / 256 ✅ MS42 512 ✅ MS43 512 ✅ MS45 + MPC 1024 ✅ ME7.2 512 ✅ ME9.2 (EK924/928) (see here for others) 1024 / 1472 ✅ MSS50 / MSS50.1 32 / 512 ✅ MSS54 / MSS52 32 / 512 ✅ MSS54HP 64 / 1024 ✅ MSS6x (MSS60 / MSS65) 5120 ✅ MSV70 + MPC 2048 / 2560 ✅ MSS70 + MPC 2048 / 2560 ✅ MED17.2.x 1504 – 2560 ✅ MEV17.2.x 2048 / 2560 ✅ ME17 / MED17 / MEV17 / MEVD17 / EDC17 4096 ✅ EDC15C4 512 ✅ EMS2000 512 ✅ MS5150 512 ✅ BMS43 128 ✅ BMS46 256 ✅ EDC16C31 + MPC 1024 ✅ EDC16C35 2048 ✅ EDC16C35 + MPC 2048 ✅ EDC16CP35 + MPC 2048 ✅ +MPC = also needs the internal/MPC file.
Don’t see your ECU listed? Check out our other IMMO off services or Contact us!
Supported cars
Common BMW and MINI models covered by the ECUs above. Engines and ECUs vary by year and market, so check your exact ECU with our ECU Finder before you buy.
Chassis / Model Engine ECU -------------------------------------- ----------- -------- E36 316i / 318i M43 BMS43 E36 323i / 328i / M3 (US) M52 / S52 MS41 E36 M3 (Euro) S50 MSS50 Z3 2.3 / 2.8 M52 MS41 Z3 2.5i / 3.0i M54 MS43 Z3 M S54 MSS54 E46 316i / 318i M43 BMS46 E46 316i / 318i N42 / N45 ME9.2 E46 323i / 328i M52TU MS42 E46 325i / 330i M54 MS43 / MS45 E46 M3 S54 MSS54 / MSS54HP E46 320d / 330d M47 / M57 EDC15C4 / EDC16C31 E39 523i / 528i M52 / M52TU MS41 / MS42 E39 525i / 530i M54 MS43 E39 540i M62 ME7.2 E39 M5 S62 MSS52 E39 530d M57 EDC15C4 E38 740i M62 ME7.2 E38 730d M57 EDC15C4 E53 X5 3.0i M54 MS43 E53 X5 4.4i / 4.6is / 4.8is M62 / N62 ME7.2 / ME9.2 E53 X5 3.0d M57 EDC16C31 E83 X3 / E85 Z4 2.5i / 3.0i M54 MS45 E85 Z4 3.0si N52 MSV70 E85/E86 Z4 M S54 MSS70 E60 525i / 530i M54 MS45 E60 525i / 530i N52 MSV70 E60 545i / 550i N62 ME9.2 E60 M5 / E63 M6 S85 MSS65 E60 520d / 530d / 535d M47 / M57 EDC16C31 / EDC16C35 E63 645Ci / 650i N62 ME9.2 E65 745i / 750i / 760i N62 / N73 ME9.2 E8x/E9x 125i-330i N52 MSV70 E9x M3 S65 MSS60 E8x/E9x diesels N47 M57 N57 EDC16C35 / EDC17 MINI R50 / R52 / R53 W10 / W11 EMS2000
Later BMW and MINI models with MED17, MEV17, MEVD17 or EDC17 ECUs are also supported. See the Supported ECUs table above.
How it works
- Purchase a license (one license = one patch).
- Upload the original read from your ECU. Any tool’s read format is accepted.
- Download the patched, checksum-corrected file in seconds.
- Flash the file back to your ECU with your flashing tool.
After the EWS delete
- If your EWS module still works, you can leave it installed. The DME no longer checks it, and the module still controls the starter. Your vehicle key must still match the EWS unit.
- If the EWS module is faulty or removed, the engine won’t crank, because on EWS cars the starter signal runs through the module. Bridge the two thick wires of the starter circuit at the EWS plug with a fuse.
- CAS / FEM / BDC cars (E6x, E8x, E9x, F and G Series): the gateway must remain in place with a matching key chip.
ECU-specific EWS delete and IMMO off tools
For some ECUs we also offer dedicated tools and services:
- MSD80 / MSD81 / MSV80 / MSD85 IMMO Off (N54, N52N, N43, N63) for Quickflash users
- MS41 / MS42 / MS43 IMMO Off patcher
- M5.2 / M5.2.1 IMMO Off
- ME9.2 IMMO Off for other ME9.2 versions
- EDC16 IMMO Off tool
- MG1 / MD1 IMMO Off
FAQ
What is EWS delete or IMMO off?
EWS (and CAS on later cars) is the immobilizer that pairs the engine computer to the car. EWS delete, also called IMMO off, removes that check from the DME or DDE file, so the ECU starts the engine without needing to match the immobilizer.
Which read tools are supported?
Any tool’s read format is accepted. Supported file sizes for each ECU are listed in the table above.
Is my file stored?
No. Your file is never stored after you download it.
My ECU isn’t listed. What now?
Check the ECU-specific tools above, our other IMMO off services, or contact us.
