I try more times with KESS v2 clone to unlock a pcr2.1 eeprom in bench, I get an error with KESS when I select READING EEPROM and after display “start communication”.

The wires are OK and voltage is OK, KESS works fine.

These are the images of my connection:

Experience for sharing and how-to guide:

Your connection looks ok…. this ecu need a big good one. an adapter +12V/3A works fine with Ktag and Kess.

then desolder eeprom and read it with programmer, you can find here the tool to unlock the prc2.1 eeprom, but beware, dont play with lock-unlock with this ecu, if you put again in car, can you get ID with kess? it is eeprom locked?

kess v2 (clone) should unlock eeprom fine, follow the kess instruction. I cant with ktag. with kess no problem.

a couple of months ago, I had try to unlock a prc2.1 in bench with ktag, it reads fine the eeprom but it couldn’t write it….then I used the kess, with kess could read unlock and write back the eeprom, and after I make DPF & EGR off by obd….. no problem….for curiosity, i tryed to unlock the original eeprom with program for pcr unlock, after i compare the two modified eeproms (from kess and from program) and is was identical….

if you follow exactly the instructions from ksuite manual, and you can’t connect with ecu, then maybe you must reinstall the ksuite program with some windows add on librarys, or your tool is not good and need to rework it…

Hope it helps!

this ecu does not require GPT like F series, so i used protocol 221 for DDE8.

Also tried use protocol 666/667 with GPT, also can’t read it.

Kess gives me communication line not present or corrupted and ktag gives check connection error.

Finally, Solved!

Ktag worked smooth, resistor made the trick.

1000 ohm 0.25W resistor on boot pin. It is EDC17CP45 BMW 6Cyl ecu,need to flip PCB because of boot pin on backside.