Elation!!!!!!........ I found a fix.
I have a 7290 that was in a loop for weeks. When all else fails...follow the directions. There is an instruction about what to do when JL CMDR doesn't work. I tried it and was able to stop the loop and program the 7290. Well after this I thought I would try this on my 7280 with the 507 problem. It worked.. So, thanks to instructions, the program JL CMDR, and this forum I now have two almost dead Berries back to life.