Currently Being ModeratedMar 7, 2012 5:49 PM (in response to creektoad)
I have found that I need to temporarily disable my anti-virus and firewall for the update to go thru. I learned that some time ago after many frustrating tries!
Hope this helps.
Currently Being ModeratedMar 7, 2012 8:41 PM (in response to iPhoNettie)
I have the exact same problem as @Creektoad. I downloaded it through the iPad OTA option in the Settings menu, and when I try to update I get the error, which gives me and option to "close" or "settings". If I choose settings it takes me back to OTA option with an "install now" button
Currently Being ModeratedMar 7, 2012 9:37 PM (in response to creektoad)
In the same situation. FWIW I had updated from 5.0 to 5.0.1 just prior to trying to do the 5.1 update. I also tried freeing some space on the iPad but it didn't help. Doesn't really seem like a "hammered server" issue.
Currently Being ModeratedMar 7, 2012 11:36 PM (in response to creektoad)
Same here, but on my 3GS.
Is there any way to remove it from the device and download again?
If I manage to download it on my Mac (which keeps failing halfway through the download right now), and I do manage to update my phone connected to the Mac, will my phone stop seeing the update as available to install?
Wow. It seems remarkable that my iPad made it through the process fine.
Currently Being ModeratedMar 8, 2012 2:12 AM (in response to creektoad)
I had the same problem. Was able to fix it by first connecting to a VPN. I was then able to download the update without any hassles.
See if you can delete(forget) your Wifi Network, Re-enter credentials and then try to download. It might work then.
Currently Being ModeratedMar 8, 2012 2:39 AM (in response to Kougon)
How do you download the update when the Ipad says it's already downloaded? When I try to install the update, I get an error. (How do you initiate a new download?)
I solved my problem by connecting my Ipad 2 to my Mac and updating thru Itunes. But what should I have done if I didn't have had that option? "Cut the cord"...not quite yet it seems.
Currently Being ModeratedMar 8, 2012 6:23 AM (in response to creektoad)
I was eventually able to download the update to my ancient, slow Mac. Then I was able to upgrade just fine.
Thinking about what I've read here and there, I'm beginning to think the problem has to do with some sort of weird timeout/sync issue between the device and whatever host. The fixes all seem to do with trying old Windows machines, changing wifi networks, changing network settings, etc. I wouldn't be surprised to hear someone else fixing this by switching to 3G.
BTW, what's it mean when I have 1.8 Gig free after the download, but also have 1.8 Gig free after the install? Was there really a download?
Currently Being ModeratedMar 8, 2012 8:50 AM (in response to creektoad)
I have also found a fix for this whereas you manually download and manually restore the ipsw through iTunes. I have posted the full instructions at trialsandtribstech.blogspot.com.