My jailbroken iphone 4 won't restore?

I jailbreaked my phone a couple months ago with absinthe. Now i want to upgrade to ios 6 and unjailbreak it.i've tried literally everything! I've tried holding down the power and home buttons, restore via iphone settings, put it on dfu mode, plugged it to my imac and try to restore it there but it still won't work! I really need help! Does anyone know of any possible solutions to my problem? If so, please leave a reply as soon as possible!

Dude, I did the same thing to my friends Iphone 4 on 5.1.1. I have been told we have to wait for an unteathered version of jailbreak. It should be out within a couple months bro. Hope this helps!

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