Foxflash programmer read and write Volvo denso MB279700 ECU successfully.
Model: Volvo V70 2016
Correct pinout, CU5T on plug.
Tried 5-6 times 13-14v.
Flipping switch in different tempo.
Update: tried many times more and flipped switch very fast and it started reading.
Unlock worked on first attempt.
Tried 5-10 times more and switched it like crazy and than it started to read.
