Issue: One ECUHELP KT200II user had the problem with writing the PCR2.1 ECU, he gave 1 image which shows how he connected PCR2.1 to KT200II on Bench, and another one image to show he failed to write PCR2.1. 
  


Possible reasons and solution: 
1.Power supply: 13.5V minimum, someone use 14v - 14.5v.  
2.Unlock by obd work ok, but Bench is better. Read eeprom, then write back eeprom. KT200II will ask if you want to unlock for programming, click on “yes” and all will be fine.

3.Firstly, do full backup
Then write eeprom and unlock
Then do a full read again
Finally mod map and write
PS: it will take a bit long time to write but never failed.

4.Try with another USB cable from PC to KT200.

For more detailed guidance, refer to the following articles:
KT200 PCR2.1 read password, Boot read ecu and unlock eeprom

Tips of using KT200II to unlock PCR2.1 via OBD / Bench

If you have any further questions, feel free to message Oliver WhatsApp:
+8618205996549