This is one user’s original feedback:
Pcr 2.1 VW caddy 2015 DPF EGR Stage 1
Step 1. upgrade with frf file with ECUHELP KT200 II to adapt injector dev min quantity
Ori 03L906023FL…8685
Upgrade 03L906023FL 9978
Step 2. Unloocked eepr in bench
Step 3. read write in OBD.
Many people ask me why make update you don’t need it to do dpf egr off only unlock this car have more prob with injector and dpf with old sw 8685 you cant adapt minimum deviation quantity you need to update ecu and all prob is fixed.

Look at the following 3 images which show reading and writing PCR2.1 100% ok with KT200II.

For your information, if you need to adapt the minimum deviation quantity with sw 8586 you can’t you need to update to process the car have more prob dpf injector and all is fixed.
And i have upgraded the firmware to adapt the injector.