31-07-2014 9:45 - edited 31-07-2014 12:31
If the tool did not help, did you try the three-button reset method already? While the phone starts-up, you hold the menu-volume(down)-camera buttons.
01-08-2014 7:39 - edited 01-08-2014 7:39
The mass-storage in your phone is like any mass-storage (your hard-disk, your SIM, your microSD): After a certain amount of writes, they fail. If your hardware (mass-storage) does not work, you have to repair it. Officially, only a Nokia Care Centre is able to do that. Furthermore, they double-check whether it is really a hardware fault. Therefore, you have to give your phone to your dealer, who sends it over to a local but genuine Nokia Care Centre.
Because the price of a Nokia N8, on second-hand market, is that low as it is, you might face a total financial loss that way.