Nokia 5800 FC

Here is the solution to try

Nokia 5800 certificate expired error when you try to install applications it is expected that in the next firmware update for the Nokia 5800.

If you have already tried the solutions as

1. re-set the date of the phone for a few months ago,

2. allow installation of software for all your program manager,

3. Turn on the confirmation certificate online

4. or re-format the phone, etc., in this case is not everything for you, try the solution below - it works!

How to fix the Nokia 5800 "certificate expired" error during installation:

1) Backup all your messages, contacts, notes, calendar entries, etc. with the help of Nokia PC Suite.

2) After the backup, you have to remove the microSD card. Do not remove the card directly, when the phone is switched on, the card and the data can be corrupted. Proceed as follows to the microSD card.

a) Press the power key, sroll down and select "Remove memory card" option.
b) Click "Yes" when asked to "remove the memory card will close all open applications. Remove anyway?"
c) Shortly after the "remove the memory card and press OK" appears, the microSD to be separated from the slot and is now dedicated.

3) Enter * # 7370 #-code on the screen to your phone to factory settings. These are all your personal data.

4) Then the phone lock code if it has not changed, before they enter a default value is 12345.

5) The phone will reboot, choose your country as "US". Some users have reported that the phone works fine, even if the selection of his country, but only some US works. In US the best choice here by now, we can later.

6) Turn the phone over and over again to the Micro SD card slot in your memmory in 5800.

7) Restart the phone and it work! The Nokia 5800 is ready to any application you signed.