Unfortunately, I have one of the failing 4iiii powermeters, which suddenly starts massively misreading the watts (over-reading) and is unable to calibrate. I have been in contact with 4iii, who sent me the instruction here: https://docs.google.com/document/d/1elLsrGRZ4P_SjmzXphXSytmUv4VKTv2jeye-riXkGUA/mobilebasic. Unfortunately, it did not fix the problem. Since there is no warranty left, I am really left with a problem here. It has only been used on my summer bike and not a whole lot.
So, I would really love to hear, if anyone knows of a fix to this problem, which seems to be so common that it comes close to being a class failure.