Cannot update my iPad2 to 5.1 An unknown error message cancels the download process. Could you please inform me how to fix this issue? Thanks!

Cannot update my jail broken iPad2 & iPhone 4S to 5.1
An unknown error message cancels the download process. Could you please inform me how to fix this issue? What is also odd is the fact that the update through iTunes is substantially bigger than downloading it directly OTA, although both methods have been unsuccessful so far...
Thanks!

About the only thing you can try is using the Online Internet Recovery system to reinstall Lion on your Mac over the top of the current install. that will reset all system files and should not touch your personal files or the apps you have installed.
Or iof you have a recent Time Machine backup use that to restore your Mac to that point in time.

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