Confirmed: ECUHELP KT200 can read and write Marelli 4AVP successfully.

Kit to use: Multifunction cable.
Connect multifunction cable as follows.

To read and write use the following driver:
->ST ST10Fxx

Look at the following cable, the red power cable is not connected, then it won’t read a mareli 4AVP with kt200.

Alright, next is to following on-screen guide to operate.