This error occurs when you install an ipsw file on your iDevice which has not been registered at the iOS Provisioning Portal. I got this error when I installed iOS 6 and had not realized I had only registered my iPad and not my iPhone at the Portal. In order to register the device at the Portal, you will need your UDID number (40 digits). Because you have already pushed the OS down to your device, it is no longer possible to retrieve it there. iTunes will not display it either, as it requires the device to be registered.
The best way to do this is to go to an iTunes backup on your PC. The UDID number is the name of the directory backups and is located here: C:\Users\<username>\AppData\Roaming\Apple Computer\MobileSync\Backup. There will be more than one number there if you have other iDevices. If you do have multiple devices and don't know which one is which, here is how to identify them. Double-click on the UDID directory name. Open up info.plist in notepad. On line 8, it will tell if it is an iPhone or iPad.
If there are more UDID directories than devices you have, then there are probably backups present from devices you had that you upgraded from. In this case, you will need to retrieve the IMEI number, which is available from the opening screen of the setup on the iDevice. To get this number, tap the power button to turn off the display. Tap it again and you will see the iPhone screen with a information button near the bottom. Click the button and the IMEI number will show up on the screen. Now match that number up in the info.plist file and you will then know which directory name to copy and paste into the provisioning portal.
If you got a hold of the ipsw file and installed it on your device without a developers license, then you are screwed...............just kidding! You have two options 1) Purchase a developers license from Apple for $99 or 2) Purchase a UDID number from a third party. If you choose option 2, then I suggest you Google Activate UDID Number
The best way to do this is to go to an iTunes backup on your PC. The UDID number is the name of the directory backups and is located here: C:\Users\<username>\AppData\Roaming\Apple Computer\MobileSync\Backup. There will be more than one number there if you have other iDevices. If you do have multiple devices and don't know which one is which, here is how to identify them. Double-click on the UDID directory name. Open up info.plist in notepad. On line 8, it will tell if it is an iPhone or iPad.
If there are more UDID directories than devices you have, then there are probably backups present from devices you had that you upgraded from. In this case, you will need to retrieve the IMEI number, which is available from the opening screen of the setup on the iDevice. To get this number, tap the power button to turn off the display. Tap it again and you will see the iPhone screen with a information button near the bottom. Click the button and the IMEI number will show up on the screen. Now match that number up in the info.plist file and you will then know which directory name to copy and paste into the provisioning portal.
If you got a hold of the ipsw file and installed it on your device without a developers license, then you are screwed...............just kidding! You have two options 1) Purchase a developers license from Apple for $99 or 2) Purchase a UDID number from a third party. If you choose option 2, then I suggest you Google Activate UDID Number
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