Actually, this thread is only about full format, the medium format lenses for the 6 × 6 format don't have to be tested first, they all work without any vignetting and that's no surprise, they were built for it and their light circle is large enough.
For your information, this is not a firmware problem, but a hardware problem. Since this model has been on the market, this topic has been discussed enough and appropriate solutions have been worked out. Please read here and here! Incidentally, there are still people who compare a medium format camera with various APS-C cameras, just ridiculous!
I think this is a much better way to interact with people with a certain topic or subject. So you can answer any questions much more targeted and also show practical solutions. Some things can also be discussed more easily and openly.