If I jailbreak could I downgrade?

I recently updated my iPhone 4S to 6.1.3 and I want to downgrade back to 6.0.1 if I jailbreak could I down grade only reson I wanted the old firmware is because its unlocked to tmobile and the unlock only works for that firmware I recently found that out now I have no service so if I jailbreak could I downgrade back

I don't think so.

Basically, no, because there's no way to downgrade because Apple is not signing that firmware anymore and the 4S can't use SHSH blobs. There's a video under sources that will give you a more complete guide on this.

Not unless you used tinyumbrella to save the ios 6.0 shsh blobs, if you didn't your SOL

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