Those who have updated to iOS 15.4.1 can no longer restore to iOS 15.4 , as Apple has removed this possibility. It is something common when new versions arrive, although in this case of greater importance, since a serious security problem was corrected.
This decision affects both iOS and iPad 15.4, which can no longer be returned from iOS and iPad OS 15.4.1, as Apple no longer signs the initial version . The update fixed issues with excessive battery consumption, and a vulnerability with the AppleAVD multimedia codecs.
The flaw in AppleAVD was very serious because some hackers knew about it before Apple itself, and they were executing attacks thanks to it. Therefore, it is highly advisable to update the iPhone or iPad to be safe from possible hacks.
For now, the company has not given too many details about the threat, waiting for iOS 15.4.1 to be adopted by the majority and Apple AVD no longer poses such a great risk. Of course, it seems that it would allow attackers to take complete control of the system without users being aware.
In the previous iOS 15.4, new emojis were released, it also allowed unlocking the iPhone with a mask and incorporated other new functions. Instead, version 15.4.1 is limited to fixing technical problems, something that is not uncommon after major updates.
Since iOS and iPadOS 15.4.1 have not raised any complaints or seem to contain any major bugs, they are the best option if our iPhone or iPad supports them. Outdated software is the number one source of threats when browsing the Internet, and Apple is serious about updating its devices.
In short, if we decide to move to iOS 15.4.1 we will no longer be able to restore to iOS 15.4 , something that is not a very good idea either. As there is a serious security flaw, we should update the iPhone as soon as possible to avoid possible problems or data theft.
