Seeing the same thing here with our 4K. It only runs forward even when the app says it's running in reverse. Running version 192 right now. I see "Stored version none" but if you select experimental you can still type in the previous version number to download. I believe we were on 190 before. I downloaded that and after reverting to it, cleared the local cache (same menu as the update firmware button). The lights went off for a good couple of minutes after I chose to revert the firmware. After it was back up I cleared the local cache, then selected to reboot the device. On reboot it appears that the firmware version I applied is still there (190), and the reverse function is working again. I just need to be sure not to click update firmware when it prompts me that there's an update available until they fix 192.