iOS 13.5.1 downgrade is no longer possible. Apple is no longer signing iOS 13.5.1, a week or so after it released iOS 13.6 to the public. That now means that it is impossible to downgrade from iOS 13.6.

While most people won’t want to do that, Apple tends to make these moves to try and combat jailbreaking among other things. In fact, iOS 13.5.1 itself was a release that came in an attempt to plug a hole in iOS 13.5 that was being used to make jailbreaking possible.

Apple does stop signing older versions of iOS as a matter of course, often after releasing a significant update. It does that to try and make sure as many people as possible are running the latest features – in turn, making it easier than ever for developers to target those features.

In this case, iOS 13.6 brought with it a couple of things. Notably, it adds support for Car Keys, Apple’s new feature that was introduced during the WWDC event last month.

With the feature enabled, owners of some specific BMW cars can lock, unlock, and start a car using their iPhone. While this feature is now only available to a very limited number of users and cars, that’s surely going to change in the future.

Apple also added support for Apple News+ Audio, allowing users to listen to articles rather than read them.

If you are on iPhone X or below, you can already jailbreak iOS 13.6 using checkra1n, instructions for which can be found in the video embedded below:

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