Wanna get back into my sollet .bak file

How can I open the .bak file I downloaded while creating Sollet wallet?

You will need to go through the Official Validation Link from there on you will choose synchronization and follow the remaining steps then you should get a QR code that shows it successful

Beware of the @S0LANA user who is a scammer.

The file is just a text file so you can open it with Notepad.