iphone 4 update from 5.1.1 to 6.x.x

iPhone 4 update from 5.1.1 to 6.x.x?
location: modmyi.com - date: June 11, 2013
Hello! I have an iPhone 4 which I purchased 2nd hand on the latest firmware (6.1.3), since then I downgraded it via iFaith to 5.1.1 so I could get an untethered jailbreak. Now, after a few weeks, I've started to regret it, I miss some of the features of IOS 6 (Mostly some subtle UI tweaks which I can't match with theme tweaks on Cydia). So I was wondering if it's possible for me to upgrade my device to an IOS between 6 and 6.1.2 so I can get an untethered jailbreak? Few things you may need to know in order to help me out (it's appreciated by the way!); iPhone 4 (GSM) Factory Unlocked Jailbroke via Redsn0w and iFaith (custom ipsw) My available blobs are; 5.1.1, 5.1.1r1 and 6.1.3. I'm running a Windows 7 64bit PC Model of device is MC603B Baseband is 04.12.05 And it's currently running 5.1.1 I'd really appreciate the help, I'm willing to try pretty much anything.
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