WARNING - There's a MAJOR problem with Apple's new iOS 9.3 update

Older iPads are reportedly being hit with an authentication error message that leaves the device unable to activate – leaving it unusable.

Worse still, Apple does not appear to have a fix for the issue. 

One user tweeted: "Updated iPad2 to iOS 9.3 and there's an activation issue! On the phone to @AppleSupport for >1 hour, no solution"

"@AppleSupport Can't activate iPad2 anymore after #ios93 update. Not even iTunes. Solution?" another added.

One frustrated iPad owner even tweeted Apple CEO Tim Cook directly to try and get an answer about the mysterious glitch.

She posted: ".@tim_cook looks like your #ios93 update wasn't tested on ipad2. No one seems able to activate after update & @AppleSupport have no solution."

"@AppleSupport iPad2 can't be activated after updating to ios9.3. Please help!"

Some iPad owners claim to have fixed the glitch by connecting their tablets to iTunes, while others said they had to perform a full restore.

Source: WARNING - There's a MAJOR problem with Apple's new iOS 9.3 update