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Siemens ECU DME flash tool for MSS60 found in E9x M3 running S65 V8 and MSS65 found in E60 M5/E63 M6 running S85 V10.
Requires FT232RL(q) chipset cable and highly recommended with ediabaslib firmware. https://www.ebay.com/itm/284709097537
BimmerTuningTools is a recommended MSP developer. All purchases, software download, activation and support are dealt with on the BTT website.