Apple released iOS 9.3 last week at the developer conference. Reports allege that older Apple devices have been locked after upgrading its operating system to the latest version iOS 9.3.

The news is confirmed by Apple support that some users can’t activate their devices after upgrading to iOS 9.3.

However, the fault appears to be on the device owners as some of them have forgotten their original username and password, which is used to set up the device. Some reported the upgrade falling over with an activation error.

A warning has also been issued about the problem along with a remedy under the heading:“if you can‘t activate your iPhone, iPad, or iPod touch after installing iOS 9.3”.

“Updating some iOS devices (iPhone 5s and earlier and iPad Air and earlier) to iOS 9.3 can require entering the Apple ID and password used to set up the device in order to complete the software update. If you can’t recall your password or can’t sign in, try these steps,” said Apple.

9to5Mac reports cite that the technogical giant has rolled out a new version of the upgrade with the build number 13E236 that fixes the issue. It is labelled under 13E233 and 12E234.

Apple had earlier issued a statement ia a website confirming the issue.

“In some cases, if customers do not recall their password, their device will remain in an inactivated state until they can recover or reset their password. For these older devices, we have temporarily pulled back the update and will release an updated version of iOS 9.3 in the next few days that does not require this step,” said the company’s spokesperson to the publication.

The latest version was out on last week at Cupertino and since then reports regarding the problem have been posted on the web.

“Cannot activate iPad 2 after upgrade to IOS 9.3. Error message: Your iPad could not be activated because the activation server is temporarily unavailable. Tried also connecting to iTunes via a PC without success,” reports a user.