So how do you re-flash the firmware? I'm having the exact same problem on a brand new DS-24. It started same as yours four weeks in but everything would work after getting past the error screen. I had replaced some switches when I first got the radio but the problem appeared about two or three weeks later. I opened the back and check all the switch ribbon cables and replaced one two nights ago and cycled power about 40 times(I notated the count to see if there was a pattern) yesterday throughout the day and night and all good. Power up radio this morning and immediately get error screen but this time after hitting ok I had like four switches that wouldn't work when looking at the switches and sticks screen(I also had some voice announcements on some and they didn't announce). Power down radio and then power up and everything works? After holding off for years to switch to a different system, I'm really having second thoughts especially with the Jeti restructuring for service and having a real intermittent problem.