An SD Connect C4, C5, or the newer C6 (VCI).
Never perform advanced coding without a dedicated battery maintainer (not a simple charger) providing a steady 13.5V+ to the vehicle. A voltage drop during coding can brick an ECU. Xentry Advanced Tool
The "Xentry Advanced Tool" is not a single product you buy off a shelf; it is a modified, unlocked version of the official Mercedes-Benz diagnostic software (Xentry). While the standard Xentry software used by dealership technicians is gated by login credentials and vehicle-specific permissions, the "Advanced" or "OpenShell" variant removes these barriers. An SD Connect C4, C5, or the newer C6 (VCI)