UNLOCK // M139 // M256 // MG1CP002

IMPORTANT

Our Unlock Service is available to business customers only in the EU, UK and USA.
UK: Please contact us before placing an order.
USA: Please contact our partner Wundertuning (New Jersey) E-Mail: sales@wundertuning.com

Mercedes MD1 / MG1 ECU Unlock

With our in-house ECU unlock engineered and executed in Germany for Mercedes and AMG 2020+ models equipped with MD1/MRD1 or MG1/MRG1 ECUs, you unlock the full potential for real ECU Tuning.
Forget about solutions like tuning boxes or piggy-back ECUs: our unlock provides the technical foundation for real software customization directly in the ECU.

✔ Unlock remains active even after a manufacturer update
✔ Unlock process completed within 1–2 business days
✔ Original file included – ready to start tuning
✔ Flashing via OBD2-Port or OBD-Bench setup
✔ Supporting J2534-compatible interfaces, e.g. Tactrix Openport 2.0, Scanmatik
✔ Affordable interface KM eFlash available
✔ Automatic checksum correction during writing
✔ A KM Flash license is included with the unlock
✔ No subscription
⚠️ Only original and unopened ECUs will be accepted!

Unlock in 4 steps

1. Purchase Unlock
2. Send in the ECU – Pack the ECU carefully and include a printed copy of your order confirmation.
3. Unlock Process – Once we receive your ECU, we’ll inspect it and complete the unlock within 1–2 business days.
4. Ready for Tuning – As soon as you receive your ECU back, you're ready to begin tuning.

Flashing

After the unlock, you can flash the software to the ECU via OBD2-Port or OBD-Bench setup using the CAN-BUS.
You will need our KM eFlash dongle or a J2534-compatible interface, such as the Tactrix Openport 2.0 or Scanmatik.
The required Windows software and license will be provided free of charge as part of the unlock service.

Important Shipping Information

Please print out your order confirmation and include it in the package — this is the only way we can correctly assign your ECU to your order.
All shipping costs (both to and from us) are the responsibility of the customer.
You can select your preferred shipping option during the checkout process.
The following options are available:

• DHL Standard (insured up to €500)
• DHL Express (insured up to €500)
• Own shipping label – in this case, please include a fully completed label inside the package and select “Own Label” as the shipping method during checkout.
• Payment and Shipping

Your ECU is processed at our location in Germany and then securely returned to you.

On-Site Service in Germany

Would you prefer to drop off your ECU in person? No problem! You’re welcome to bring the unit directly to us — we’ll complete the unlock as quickly as possible, and in most cases, you can take it back with you the same day.

Important: Please select “Pickup” as the shipping method during checkout. An appointment must be scheduled in advance to ensure a smooth process.

Rules and Conditions for ECU Unlock

• The offer is intended exclusively for business customers.
• In very rare cases, the unlock may not be possible due to the software version on your ECU. Unfortunately, this can only be determined during the unlocking process. If this happens, you will receive a full refund for the unlock service – however, shipping costs are not refundable.
• The customer assumes full responsibility for the shipment while in transit. We do not accept liability for lost or damaged packages.
• Only original, unopened ECUs are accepted.
• Previously opened, tampered with, or modified ECUs will not be processed under any circumstances.
• If any manipulation is detected, or if the control unit has been previously opened, modified, or is not in its original condition, the unlock will not be performed. In such cases, no refund will be granted.