Thank you and everyone who responded. I think that was the process step I forgot/overlooked.
Now I cannot access the phone with adb, fastboot or other tools and methods, I cannot send commands or files.
I have no idea how to use it yet, but I am downloading the original ROM file that is said to be for this phone in another forum.
https://www.mediafire.com/file/abhat8rlf18m3kl/gsmturkey.zip/file
As a last resort, I will send the phone to the technical service, but I am still researching to see if I can do something myself. I am still open to all suggestions 