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Project #2863

MS41 1429861 657720

BMW - MINI Car Petrol STAGE1 + REVLIMIT + LAMBDA OFF + KNOCK OFF + IMMO OFF ✓ Completed Jan 15, 2026

Vehicle & ECU

ECUMS41
Brand groupBMW - MINI
Vehicle typeCar
FuelPetrol
File size256.00 KB 262,144 bytes
Completed
Automated processing≈ 240 min
Status✓ Completed & delivered
Original file1429861_WBADD41030BT53796_fullread.bin

Software identification 2

Software number1429861
Version / upgrade657720

Operations performed 5

  1. STAGE1 automated · solution rev 28 · ~15 min

    A safe performance tune that needs no mechanical changes and does not harm the vehicle.

  2. REVLIMIT automated · solution rev 6 · ~20 min

    Adjusts the engine rev limiter (hard cut) point.

  3. LAMBDA OFF automated · solution rev 7 · ~5 min

    Disables the oxygen (lambda) sensors.

  4. KNOCK OFF automated · solution rev 2 · ~20 min

    Disables the knock sensor on supported models.

  5. IMMO OFF automated · solution rev 7 · ~180 min

Other solutions for this ECU 7

Every operation below can be ordered for the same MS41 file (petrol). Prices are per file in EUR; automatic solutions are delivered within minutes, engineer-assisted ones are prepared by our tuning team.

STAGE1 A safe performance tune that needs no mechanical changes and does not harm the vehicle. done in this project ✓
STAGE2 A performance tune that requires hardware changes such as exhaust, filter or DPF removal. automatic, 2 ready solutions for this file size · ~60 min 40 EUR
LAMBDA OFF Disables the oxygen (lambda) sensors. done in this project ✓
VMAX OFF Removes the speed limiter (Vmax) or sets it to the desired value. automatic, 3 ready solutions for this file size · ~5 min 5 EUR
MAF OFF Disables the mass air flow (MAF) sensor. automatic, 1 ready solution for this file size · ~10 min 30 EUR
POPBANG Creates exhaust pop & bang / crackle sounds; requires a decatted exhaust with few silencers. automatic, 9 ready solutions for this file size · ~15 min 20 EUR
KNOCK OFF Disables the knock sensor on supported models. done in this project ✓
IMMO OFF done in this project ✓
REVLIMIT Adjusts the engine rev limiter (hard cut) point. done in this project ✓
DTC OFF Permanently disables the fault codes (DTC) you select; you need to provide the P codes to turn off. automatic, instant 10 EUR
CHECKSUM OK Automatically calculates and corrects your modified file’s checksum; if your tool cannot do checksums, we do it for you. automatic, instant 1 EUR
REV ORI engineer-assisted, on request · ~120 min 10 EUR
Have a MS41 file? Sign in to the ECUHARD platform, upload it and pick the operations — automatic solutions are ready in minutes, 24/7, invoice issued automatically.
Sign in & upload your file →

About this project

Siemens MS4x is a BMW petrol ECU generation. This unit is fitted to BMW - MINI Car vehicles. Project #2863 was completed automatically by the ECUHARD file service for a BMW - MINI Car vehicle running software 1429861 657720.

Frequently asked questions

What was done to this MS41 file?

Operations performed: STAGE1, REVLIMIT, LAMBDA OFF, KNOCK OFF, IMMO OFF. The modified file was checksum-corrected and delivered ready to flash.

What is the software version for this MS41 file?

This project is for MS41 with software numbers: 1429861 657720. The same operations apply to other vehicles running the same software.

Can I get the same tuning for my BMW - MINI?

Yes. Sign in, upload your original ECU file (MS41 or any supported ECU), choose the operations you need and our automated system prepares the file, usually within minutes, 24/7.

I read my ECU with a different tool — will the tuning fit my file?

Yes. Every operation is applied to the file you upload — your own read from your own car — so the tool and the read mode do not matter: the modifications are located by content, not by a fixed file layout. If your file was modified before, our REV ORI (revert to original) module repairs every changed area back to the stock values first — no matter which tool or method read it (KTAG, KESS, Flex, Autotuner, CMD, OBD, bench or boot) (10 EUR). A compatibility problem is therefore impossible.

I have an OBD read — can you tune it, or do I need a bench/boot read?

An OBD read is fine as long as it contains the software area (maps). Upload it; the platform detects the ECU and software number and shows which operations are available for your file. If the read is partial and an operation is not possible on it, you will see that before paying.

I read boot mode with KTAG / bench with Flex / bench or OBD with Autotuner — which read do I upload?

Any of them. Upload the file exactly as your tool saved it (MS41 reads are supported in OBD, bench and boot form). The system works on your own read, so nothing has to be converted or matched to a different device.

Do you need the full backup (EEPROM, other sectors)?

No. Only the software-related part of the ECU is used: the maps area — the internal flash and/or the external flash, depending on where the software lives in that ECU. EEPROM and other memory sectors are not needed and are never modified. Keep your full backup for yourself as a safety copy.

How can I be sure the result will be compatible with my ECU?

Because the file returned to you is your own read with only the selected areas changed and the checksum corrected, it flashes back with the same tool and method you used to read it. The software number stays the same; nothing else in the file is touched.

What other operations are available for MS41?

STAGE2 (40 EUR, automatic, 2 ready solutions for this file size); VMAX OFF (5 EUR, automatic, 3 ready solutions for this file size); MAF OFF (30 EUR, automatic, 1 ready solution for this file size); POPBANG (20 EUR, automatic, 9 ready solutions for this file size); DTC OFF (10 EUR, automatic, instant); CHECKSUM OK (1 EUR, automatic, instant); REV ORI (10 EUR, engineer-assisted, on request). Prices are per file.

I have a MS41 file — how can I get it done?

Sign in to the ECUHARD platform (solutions.ecuhard.com), upload your ECU file, select the operations you need and confirm. Automatic solutions are delivered within minutes, 24/7; engineer-assisted operations are prepared by our tuning team. Each file is checksum-corrected and an invoice is issued automatically.

Do I need to send my original file?

Yes — upload the stock read of your ECU. If you do not have it, our original file archive may have a matching file by software number.