I have exactly the same problem at the moment. Any news from your mod?
For what i've searched this is a fairly common problem with this mod, many people complaining it dies after the firmware update. My mod arrived 3 days ago and I was happy with it, it is very well assembled and tough. Yesterday I remembered to update the firmware, all went well until it simply did not turned on any more after that. I changed batteries, turned it to the power and it just does not give a signal. When I press the - /+ button no information appears but when I connect via USB it is recognized.
Help me please!