Apple is no longer signing iOS 15.4 after the release of iOS 15.4.1

Apple has stopped signing iOS 15.4, which means that people will no longer be able to install that particular version of the iPhone software. The result is that iOS 15.4.1 is the only version of iOS that can now be installed on devices.

The move comes just a week after iOS 15.4.1 was released to the world – an update designed to help some devices deal with unusually high battery drains.

The same update fixed a problem that could cause some hearing devices to lose connection with some apps, while a solution was also applied to Braille devices to become “unresponsive when navigating text or displaying a warning”.

Apple often stops signing older versions of iOS so that people don’t downgrade. That could be a couple of reasons.

First, it can be ensured that the safety holes are not reopened after being fixed in the next release. The second reason may be to make sure that the latest APIs are made available wherever possible.

Apple is already testing iOS 15.5 in the public beta program for developers as well, and it’s only a matter of time before that update becomes available to everyone. Once that happens we can expect Apple to stop signing iOS 15.4.1 – although it is still not expected to be for a few weeks.

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