Fix Activation Mode Error on iPhone, iPad and iPod Touch – Apple is currently hunting down iDevice users that runs iOS beta firmware activated using UDID purchased from reseller. Once they get it, they’ll disable the device. Thus might cause Activation Mode Error.
What might caused Activation Mode Error? If you are running iOS 5 beta 1 and beta 2 (iOS 5 b1 and iOS 5 b2), then this is because iOS 5 beta 1 and beta 2 have expired on August 4, 2011. So that’s normal.
For now, you’ll need a valid Apple Dev account to get valid UDID to activate your iPhone, iPad, iPod Touch running iOS 5 beta 4 (or may be later version). Just FYI, official price to purchase Developers spot is $99 annually.
How to Fix iOS 5 Activation Mode Error?
So far, easiest solution for this is to downgrade your iPhone to iOS 4.3.3. Why iOS 4.3.3? Well, so far iOS 4.3.3 is easiest version of iOS 4.x.x that you can jailbreak it untethered using JailbreakMe while iOS 4.3.4 is still a tethered jailbreak.
How to downgrade iOS 5 to iOS 4.3.3? The steps are still similar with iOS 4.3.4 downgrade.
Lets hope someone will find a workaround hack to fix iOS 5 Activation Mode Error caused by this UDID issue.