Most W204 W207 W212 ESL will damage with EIS. In this case, there are two possible reasons and solution:
ESL motor is damaged and need to replace a new motor
NEC chip is locked, theoretically it can be unlock, actually it needs to replace new ESL.
Xhorse Universal Smart Proximity MQB Type 3 Button Remote Key XSMQB1EN work with MINI Key Tool/VVDI2/Key Tool 5pcs/lot
Quality ESL/ELV Steering Lock Motor Wheel for Mercedes-Benz W204 W207 W212
Noiseless, power enough solid, durable and superior quality.
Once installed, it is ready for use.
Works for W204, W207 and W212, E series or C series, like C180, C200, E200, E260, E300, E350, GLK300, GLK350
EIS/ELV Test Line for Mercedes
No need to have car for test
Can work together with VVDI MB BGA Tool