As I posted above, I bricked my GTV 220 during an upgrade. Actually I don't think it is fully bricked as it partially starts but freezes before boot completes.
I suspect that the bootloader program is faulty.
I have tried a variety methods to get it to the point where it will boot to the point where it reads an update on a SD, but it simply freezes before it can.
I have tried all combinations of the reset switch/power plug/power switch. Nothing!
I opened the unit and found an internal reset switch. I tried every combination, no luck.
I saw an internal USB port with a WiFi receiver for the wand. I removed and plugged in a USB cable and connected it to my PC hoping that I could access the onboard system areas or bootloader program or something so that I could reflash it or something. All it did was to power the box up but it still froze during the boot.
The PC did not even recognise that the box had been connected. It was similar with the two external USB ports. I also tried it with my operating ATV 1000, same thing. (Note: If your power supply dies, then the box could be run from one of its USB ports with a mains power/USB adapter - what about in the car with a car TV/Video/DVD and USB car charger??
Having a look around inside the unit, I note one free 2 pin, one 3 pin and one 4 pin sockets. Could these be used to reflash the box, if so, how?