Apple suddenly released an iOS 12.4.2 update for older devices, improved system stability and added patches that have not been fixed from the previous version. This update only applies to certain devices, most of which are older devices removed from the iOS 13 upgrade support list.
If you are using devices that are on the list of updated support and are not interested in jailbreaking issues (iOS 12.4), you can perform the upgrade via OTA
- (Settings> General Settings> Update). software update)
Besides the iPhone, iPad and iPod touch, the company also released watchOS version 5.3.2 for Apple Watch Series 1/2, before receiving the watchOS 6 update later this fall.