iphone 4 tethered jailbreak help

Iphone 4 tethered jailbreak HELP!
location: macrumors.com - date: April 19, 2012
Well, my friends iphone 4 had been jailbroken, the battery died, and now hes iphone boots but dies after 5 minutes. PLEASE HELP!
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need help restoring iphone 3gs on 4.3.4 tethered jailbreak to factory settings
location: modmyi.com - date: December 9, 2011
I have an iphone 3gs on 4.3.4 firmware. I used this redsn0w to jailbreak my phone. I am having a lot of errors trying to restore my phone. I replaced the host file and restarted my computer and trid to restore it in DFU mode to 4.3.4 but i get an error 3194. I have heard there are other programs you can use to restore the phone if itunes won't work. What are my options to restore this phone? I want to restore it to factory settings, i just want to wipe it completely clean at this point. I really appreciate any help
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