Is there a way to roll back the firmware? My K3MarkIII started having issues with the backscreen the day after I updated the firmware. The first time it occurred, the settings display stopped showing but I was able to keep shooting by checking settings through the viewfinder or LCD screen. At first, even though the settings wouldn't display, I could review images with the backscreen, but that stopped responding as well after a while. The menu would still come up and display, however. Which was good, as that meant I could reset the setting. After the reset, it started working again properly for the rest of the day. The next day, however, the settings display issue returned but never progressed to not showing the image playback. As during the day before, doing a reset got it working properly again. After two resets in two days, I've got my preferred settings well memorized now! It is sort of acting like the eye sensor is reporting that the camera is at my face, even when it isn't obstructed. I tried turning the eye sensor off, but only the settings reset helped. Maybe it is just a coincidence the issue started the day after the firmware update, but I'm hoping to test that by rolling back the firmware.
The timing of the issue was very inconvenient. I was in a small aircraft photographing colonial waterbirds for work and paying the pilot $455/hr for the flight time. I had a K1MarkII as a backup and that I was able to quickly switch systems, but ultimately we were forced to land so that I could troubleshoot the problem with the K3MarkIII on the first day.