Not long after releasing the emergency security patch (RSR) to iPhone users running iOS 16.5.1, as well as iPad models running iOS 16.5.1 and Macs running macOS Ventura 13.4.1, Apple had to remove the patch. this soft.
According to MacRumors, Apple’s removal of the RSR emergency security patch could be due to an issue that caused certain websites to not work after RSR was installed. This comes not long after users who have installed RSR say that Facebook, Instagram, WhatsApp, Zoom, and other sites started to warn about not being supported on the Safari browser
Essentially, while the RSR updates for iOS 16.5.1, iPadOS 16.5.1, and macOS Ventura 13.4.1 are all intended to fix a WebKit vulnerability that Apple admits was exploited by hackers, there looks like updates changed the Safari user agent causing some websites to break.
After pulling this update, Apple will likely re-release the RSR once the aforementioned issue is resolved. Those who already have the update installed can downgrade iOS (or iPadOS) by going to Settings > General > About, then tapping iOS Version. The same is possible on a Mac