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Please try to again using 12345 if you get the same error wait for 5 minutes and try it again.
Wait for five minutes, and then enter 12345 carefully again. If the problem persists, contact your nearest Nokia Care Point.
I heard that some nokia models will reset its security code after upgrading using NSU (Nokia software Update). You can upgrade your phone's software but before that you should bear in mind that you can't undo the update or downgrade your phone software.
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