Forgot security code on old phone

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The default security code for Nokia is 12345
IMEI: 354827019225562
Master code: 6764307061
Close all applications on your phone.
With your phone switched ON, remove the battery.
Then remove the SIM card.
Replace the battery without the SIM card and switch your phone on.
Type in the security codes (anything) until the phone request the Master code, (in the phone lock window) when it does, leave your phone still, don’t use it for 15 minutes, then type in the Master code.
This is the code needed to reset the Security code, nothing else, and it’s for your phone only.
If your phone doesn't request a Master code, you will have to reset the Security code via an unlock device (box). The phone has to be connected directly to the device.