Upgrading OTA while jailbroken?

[Tartarus]

Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

Hello, I have an iPhone 4 and it's jailbroken, and I want to upgrade to 5.1, just one problem, ever since I jailbroke my iPhone I haven't been able to get any computer, pc or Mac, to recognize it, it only gets recognized in dfu mode, I'm wondering if I can update to 5.1 OTA and not brick my phone, and If it can unjailbreak it that would be ideal.

 

[Intell]

The OTA update won't work. Apple put in a check that prevents it from working.

 

[Tartarus]

Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

The OTA update won't work. Apple put in a check that prevents it from working.

Ok, so is there a way I can use a software update file from my brothers iPhone 4, boot in dfu mode and install the ipsw file to it? (with redsnow)

 

[Intell]

You can put your iPhone into DFU mode and restore it in iTunes. This will remove your jailbreak. redsn0w is not able to update iOS.