[503] Nokia Asha // I Need Help ! Please :(

Hello forum members.
The first thing I wanted to write this is that I use a translator, because hard with my English, also apologize in advance for any errors ^^
Namely, I have a big problem with the Nokia Asha 503 RM-920 Single Sim.
Problem: I have the above-mentioned phone network Orange Poland, which as you know has a SIM lock. I tried to download sim lock the methods described on the internet, and after many attempts, I attach the phone and see standard Nokia logo, and after that there is a white screen with an inscription on the middle of the "Contact Service". And here is my problem and question whether there is any possibility of repair of this fault?
I ask for prompt assistance. Please! Thank you for any help given. advice.

Yours HasekPL.