i have 6680 branded on vodafone from japan. i changed the firmware successfully using the instructions here.but after changing the firmware menu button isn't working anymore.
here is what i did....
i) took back up of memory onto sd memory card.
ii) changed product code to 0521637 (product code of france) using nss
iii) then upgraded the firmware using nsu
iv) changed product code back to original product code.
v) restored the back up of memory from sd memory card.
now when i press the menu button,nothing happens.plz help me on how to fix this problem. thanks.