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i) perform firmware update by visiting "http://nds1.nokia.com/files/support/global/phones/software/NokiaSoftwareUpdaterSetup_en.exe"---> this will download a software, u have to install it, run the prog, follow onscreen instructions, bios or firmware will be updated(make sure u already have Nokia PC suite installed, Connected to internet........this is an online update....)
here when we do online firmware update or bios update all the functionalities of ur phone return to factory mode....
if you really, really, REALLY, want to clear the memory of every name/number you have ever sent a text to or whatnot, you can reset your phone to factory settings, but that resets the settings, preferences, wallpapers, profiles, and everything else you have modified.