I've been running ATV black with FireCore/ Infuse for some months now untethered. Yesterday I found by atv stuck at the spinner (my wife was using it, no idea if if anything actually happened).
Now the atv is stuck at this stage even after a day. Rebooting after powering off gives blinking led during boot and ends up in the spinner again.
Any idea what might have happened and- more importantly- how to fix it? Restore in iTunes? Be careful to get a specific version to not loose jailbreaking?