Apple has re-released iOS 12.1.2 just few days after its original debut, last week Monday. The second build of iOS 12.1.2 is available for download for those users who didn’t install the update previously. This means users who already updated their iPhone models to iOS 12.1.2 following its arrival earlier this week won’t receive the second build. The original software update brought bug fixes for eSIM activation on the iPhone XR, iPhone XS, and iPhone XS Max. The change-log does not indicate any changes in the second build.
The second build of iOS 12.1.2 carries a different build number, spotted by folks at AppleInsider. The original iOS update had build number 16C101, while the re-released update that was pushed on Thursday (in the US) has build number 16C104.
Apple has not yet specified the prime reason behind issuing the iOS 12.1.2 update for the second time. At this point we can only assume that the new build may include some of the fixes that were missing from the previous release.
How to download iOS 12.1.2 update
The iOS 12.1.2 update is compatible with all the iPhone models running iOS 12. To download and install the latest version on your device, go to Settings > General > Software Update and then follow the on-screen instructions.
Your device should be using a Wi-Fi connection to download the over-the-air update. Also, it is recommended to back up your data, and ensuring your device has over 50 percent of charge or connected to a power source before beginning the update process.