How To Open Lg Kf510 phone When I Forgot The Secuirty Key

My friend locked her LG KF510 phones and forgot the secuirty key, she ask me:”how can i open it again without loosing any data”.
I have some solutions found on the Internet. If you do not have the security code,You have 3 choices:

1. Replace the device
2. Send the device back to the manufacturer or take it to a shop to have the software flashed and reloaded
3. Start at 0000 and keep adding 1 to it (0000; 0001; 0002; etc) until you hit the right number

Hope this is useful! Enjoy!

LG Ff510 pictures and features:

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