you might have got a good one......like Komodo, I have tried every possible way! re-installing, factory reset, swapping out the old PTFE set up, changing temps, changing feeder pressure, changing Bowden tubes, ( I tried swapping the heater blocks but when I went to remove my old one the heat sensor wire broke inside of it so made me a bit upset), opened the feeder to inspect, I don't feel like typing it all down but I've done it all and it has frustrated me beyond belief! I had 3 good prints come off my printer after the upgrade (6 hours of printing)..............after that it was nothing but fails.
but good on you for having a working printer! lol
I'm two weeks behind on my work and soon to be three!