Help! I rooted my Galaxy S3 about 3 months ago. I wanted to return it to stock without root so I could use the stock recovery and receive the new 4.4 OTA. I found a file online off a YouTube video that I thought was for my phone. I flashed it using mobile ODIN and when it powered back up, I had no mobile network and could not make or receive calls. I tried another file I downloaded and I installed from zip when I was in receovery and now the phone will not power up and does not have the light on when its connected to a charger. It seems to be dead.
I installed from zip because it kept failing when I tried to use ODIN on my computer.
How do I fix? Can it be fixed? I don't know anything about all the technical stuff such as modems, kernels, etc. I should have left it alone!
It's an AT&T Galaxy S3 SGH-1747