05 February 2009
Nokia 5800 error "Expired certificate" solution
The main action you have to do is to reset your phone's software to manufacturer state via key sequence *#7370#. Device ask you to enter lock code, it should be 12345. But you can backup all your data before this action with Nokia PC Suite and restore it after resetting software.
Also it's better to update phone's firmware to latest version (to check version number press *#0000#) because in older versions you may still got "Expired certificate" error message sometimes later.
That's it! Now you can install any application you want, even developed for older S60 3rd Edition devices like Fring, Google Maps, Mobiola, etc.
After resetting your phone, you will find the music files and videos that came with the phone are locked and the best part is Neither Nokia Care nor Nokia Priority knows what to do about it !!
I want to say many thanks for sharing this simple and yet easy to DIY steps to enable all the 5800xm users a solution to resolve the bugging and irritating error occurring in the mobile's OS.
I had downloaded tons of applications and themes from various sites & forums. They all are now fully functional and usable in my 5800xm.
Just change your date forward but not BACKWARD!!!. For me it was on 1 june 2009 and i changed it to 1 june 2010. By some own "Magic" I can now install all compatible app even when I changed back my date to normal. GOOD MAGIC LUCK!!!
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