I recently updated to 6.1.3 on my iPhone 4S now I want to down grade?

I've recently updated my iPhone to 6.1.3 I was 6.0.1 I also had a unlock on my phone that switched me to tmobile so when I updated my service went away any solution on how to down grade back

I hate to break it to you but without saved SHSH blobs its not possible

The only way to loose the software update to what you had prior is to do a factory rest on your phone

Jailbreak it. By downloading the necessary files and then downgrade it. No official software will let you get back down

Not possible.

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