M139 fans, your tuning options just expanded. Big time. We know German OEM's like the Bosch MG1 ECU series and it certainly gave tuners trouble early on (many big names are still struggling with it). However, as time marches on so does the ability of tuners to get into the ECU and the latest MG1 crack is by ECC allowing OBD-II flash tuning on AMG MG1 equipped models.

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Models such as those with the M139 I4. This engine will be in the next generation W206 C63 but it already is featured in the current A45, CLA45, and GLA45 AMG models we know and love.

No need to send your ECU into the middle of WW3 for a crack:

Today we made some HUGE progress in the Mercedes Bosch MG1 ecu development! We are excited to announce that we now offer obd2 flashing and data logging for most Mercedes using the MG1 ecu!
Well done ECC!