Default [Q] Service to fix soft-locked Galaxy S3?

I have a T-Mobile Galaxy S3 (SGH-T999). I installed Cyanogenmod 11 on it using Odin, etc. After a while I tried to revert back to stock t-mobile/S3 rom, but I messed up something and my S3 is stuck on a glowing "Samsung" logo. I tried a few things without success.

I could spend a lot of time trying to fix this (and maybe I will try a few more things), but is there a service available that will fix these kinds of issues for a reasonable price?

Regards,
- Henrik