How to get my iphone 3gs out of semi tethered jailbreak without redsn0w?

My iPhone 3gs is on ios 6.1.2 evasi0n semi tethered jailbreak and when I try and use redsn0w to boot tethered it always gives me an error code about the ipsw even though I have tried many different ipsw's from different locations(websites). None of them seem to work and I just want to be able to use cydia… Could someone please help I've tried everything

Restore it.

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