How to Hard Reset for Nokia N97
Usually the performance of cell phone software that is causing the problems, can be corrected with a hard reset to fix issues. The hard reset is different from the soft reset. If the soft reset just restart the phone without affecting the file system or data that you have saved, not so hard reset. All data will be lost, before the hard reset, you should backup all important data such as Copy all contacts to mass memory for quick reinstall later, within contacts application, or you could use Backup in File Manager to copy Contacts, Calendar and Bookmarks to a memory card?
Hard Reset the phone my dialing *#7370# from the homescreen and entering Lock Code 12345. Phone with now hard reset to the original firmware and factory settings. Once finished it will restart and ask you to enter region, date, time, etc. as if you just took the phone out the box when you first purchased it. Other Application Data depends on what applications you have installed, have a look yourself and save on mass memory.
Another Way Hard Reset for Nokia N97:
To format your phone do, Press Caps shift, Space bar, Delete button, Power On button together for 5 seconds. the phone will restart and Reset.
How to do hard reset(Format) in Nokia 5800 :
Press Green button, Red button, camera key and the power key together for 10 seconds, phone will restart. If not switch off the phone and again hold all 4 keys for 10 seconds, phone will restart and will ask the time and date settings like a new phone.
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