Sorry if this has been covered, I couldn't find it in the search. I had my iphone 4 on the beta ios5 software with no issue from the first release in June through the latest. However, I got a replacement phone yesterday and after having my UDID registered I tried to restore the software. For some reason, now every time as it gets to the "verifying with apple" the restore fails with an error 20 and leave the phone in recovery mode. I've tried multiple times, verified that my UDID is registered on the developers' account correctly, tried different downloads of the firmware, and still the same error. The only bit of info I could glean from the more info link to apple's website is that it has something to do with security software but I have no third party software on my machine and it worked fine with the previous unit. The kicker of course is that all my backups are incompatible with the old software so I need to get it restored to the beta so I can recover my data. Any ideas appreciated, many thanks!