With Xtool M822 Mercedes-Benz all key lost communication adapter, you can save up to 65% of the calculation time on the process or save yourself from plugging and unplugging the key emulator hundreds of times.
Tried to do all keys lost on W204 2013 model, it reads the EIS nocely and quickly, but when i comes to password calculation it stops and say failed to communicate after it reaches 1/50 password calculation stage, all connections were correct and wifi was connected