How to restore my jailbreaked iphone 4s ios 7.0.6 without updating to 7.1?

I have full storage and I already delete all my applications and media and I still have problems for that reason, I read in some blogs that may be caused for corrupted files and the only way to fix it is doing a full restore, the only problem is that apple released the IOS 7.1 which it would make me loose my jailbreak, and of course I want to avoid that, does anybody knows how can I perform a full restore without updating, thank you.

Use Coolstar's semi restore found here http://semi-restore.com/

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