I bought a pandora+magic memory stick kit which I used to upgrade to 5.00 M33-4. After reading up on the forums I saw that 5.50 D3 was meant to be much better and in all the guides it said it would be able to upgrade from M33-6. I assumed M33-4 would be pretty much the same and I managed to put it on there and get it to load up. However when i pressed re-boot it didn't start up properly, and now whenever i switch it on the power button flashes green for about 5 second, the screen remain black and then it switches off.

I've tried changing all the files on the memory stick back to M33-4 (via recovery mode) and starting it again but it's still not working :(

Have i bricked it or can it be fixed?

Thanks