Somewhat unexpectedly, Apple released the fourth beta version of iOS 18 and iPadOS 18 in the early morning of July 24, but in the early hours of this morning (July 27), Apple pushed the fourth beta version of iOS 18 and iPadOS 18 again.
As is customary, Apple has released the same version, which we call a revision, and this revision will not add any new features, it will mainly fix bugs.
After updating to the iOS 18 beta4 revision, it has a version number: 22A5316k, while the previous iOS 18 beta4 version number: 22A5316a, so the iPhone that updated the previous beta4 can still be upgraded again.
In the last beta4 version, after some models turned on auto screen brightness, the screen brightness of the phone sometimes dropped to the lowest point when the phone turned off the screen to re-waking the iPhone, and users had to readjust it if they wanted to go back to the previous setting.
Upgrade suggestion: Personally, I don't recommend blindly upgrading to the latest system, especially older devices, but if you're already running the iOS 18 beta, you can choose to upgrade.