Did you update your iphone without backing up your SHSH Blobs? Well then your just like me, luckily, thanks to GeoHot. Ive been able to jailbreak my iPhone with 4.1 firmware. Hope this helps and comment if you have any questions
www.limera1n.com
How To Jailbreak Your iPhone with 4.1 Firmware : No Downgrade
DeviantNetwork
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