keyguard security code

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hi i'm using Nokia5130express music. first cheers to all those who use the same. here goes my problem. i have my changed the default security code to lock my keypad but i forgot it now. i am unable to lock keypad with the security code again. how can i recover the code? i dont want to flash my mobile as all my data will be lost. is there any other method to recover?thanks in adv,