How to unjailbreak iphone 3GS without internet?

I'm using iphone 3gs ios 6. I had tried to restore from backup. But it is jailbroken after restoring. Then I had tried to restore in DFU mode.itunes wants to download above 700MB Data to restore. My internet connection is too slow. I can't use that much of data

You mean to tell me it still jailbroken after restoring. Then maybe it better if you go find a faster connection on your computer. Gotta have a laptop.

You just need to reset the whole phone settings once. And your iPhone will be unjailbreaked.

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