Kess V2 V5.017 Plus Ktag...
For Some Vehicles, KESS V5.017 can read and write ECU via OBD2 Cable Directly, do not need to open ECU, Easy To Operate !
But For Some Vehicles, It needs to disassemble ECU then can do ECU programming . K-TAG V7.020 works in this way ,K-TAG 7.020 read and write ECU via TRICORE or BDM Or Other Mode with special cable, But the software will guide you how to operate !
When you are not sure your vehicles ecu can be read and write via OBD2 Cable or must be disassemble, then it is better to get both KESS and KTAG