Originally Posted by kosopet
So, have you any idea what all this could means ?
It doesn't seem likely to me that the tiny blip in the image is significant.
You say that the setup procedure works only for the last 6 keys. Does that mean that those keys are successfully retrofitted? (You can control them via MIDI after the setup is complete?)
You might try to reduce the install to just one key (one data line and one select line) and then try to troubleshoot only that one key. If you can get it working, then try to build from there.