Hi....
For this check your battery.whether it lock to battery slot correctly or not.
If not just put thick small paper piece on the battery while closing the outer lid.
If battery lock correctly you need to flask your phone(This problem due to virus).
flash(format) resets your security code to 12345
(formating delete all data including messages,contacts,etc... So i suggest you to back up all the files before formatting You can back up file using Nokia PC suit)
To back up your files
*Install the Nokia PC suit
*open Nokia PC suit >Select Back up
To restore Backed up data
*Open PC suit>Tools tab>Restore>Select Restore>select a restore point(restore point is file in which all data's are saved)>Ok and wait for 5-10 mins.
To flash you need
*USB cable compatible with your handset
*A Computer
*Nokia PC suite of your handset
*Internet connection(Min speed 1Mbps)
*Nokia software updater(you can download by using Nokia PC suit)
To flash
*Install the PC suite
*Connect to USB
*Open the PC suit
*Select UPDATE PHONE SOFTWARE(dowload the Nokia Software updater by selecting this option)
*Install the "NOKIA Software Updater"*Select Update**....(It takes 10-30 Mins)
**Please don't disconnect while updation process
Thank you have a nice day
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