If you absolutely must have an untethered jailbreak at this very moment, there is always the option of downgrading back to iOS 4.3.3.
Assuming you saved your SHSH blobs for the last firmware susceptible to an untethered jailbreak, you can follow this video tutorial and downgrade to iOS 4.3.3 in about 10-15 minutes. Inside we show you how, step-by-step...
If you're the type of person who likes to sell your current iPhone and use the funds to upgrade to the latest and greatest iPhone, then you've been there before. Restoring your iPhone to stock, and cleaning it up, is essential if you want to ensure you get top dollar for your device.
Thankfully, Cody already covered quite a few bases in his article, here. But what if you're still having issues downgrading your iPhone, or getting it back to stock after jailbreaking? I know a lot of you have personally told me about your struggles with the iPhone's dreaded recovery loop.
If you're having issues downgrading your iPhone back to iOS 4.3.3, issues with iTunes Error (1), and/or you're stuck in the recovery loop, and can't get out, this video tutorial should fix what ails you...