My mother! fiddling with my phone I blocked it! and now when you start up you only see the Nokia logo and it doesn't do anything else. I have tried to flash it but it gives me an error. security error code 10, security failure when starting flashing. What can be?
Thank you very much for your help.

EDIT: I was able to solve it now. The error when flashing it was that it did not choose the appropriate file image.