Here we go.
First of all, connect XP400 by USB cable
IMMO→ Mercedes Benz→Smart Mode→ On Vehicle
Reading vehicle information…→ E250 coupe W207→ Add key
Read Eis data→ Press[begin]
Reading working key information→ press remote button check frequency→ insert ignition key into IR key hole on programmer
Reading blank key information→ check blank key frequency→ insert blank key into IR keyhole on programmer.
Press [ok] to enter password calculation process(maybe need to insert and remove key several times before it can start)
Insert the ignition key into EIS for 5 second, then pull the ignition key out.
Insert the ignition key into EIS and wait 2 second(please confirm whether the key can be turned to the ON position if not try again)
After pulling the ignition key out, insert it into IR keyhole.
Acquiring password process: need 10-30 minutes. Please wait…
Insert the ignition key into the EIS for 30 second.
Password calculation completed→press [ok] go to key addition process
Generate key file
Insert blank key into IR keyhole and press [ok]
Writing key file
Key addition completed
Insert key until led lamp on key light up and go off
Test remote: ok