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Siemens DME MS41.0, MS41.1, MS41.2 Flash Tool for M52(non-tu) and S52 Engines.
Requires FT232RL chipset cable. 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.