I used this link and unfortunately I was unable to pair the device.

Yes

I also checked and tried the method provided on the website, but I couldn't pair the device.

I know, but the key is null in the file, that's why I can't get it

Thank you for the advice

Tylko co w tam robił Rutkowski i dlaczego na zdjęciu pozuje w swojej nowej fryzurze? Przypadek? Nie sądzę.

I'm not able to get the authorization key, but it could be because my phone isn't rooted.