From now it is possible to download and install iOS 9.2.1 on iPhone as Apple company has just flipped the switch and made available this public update for all supported iDevices. The final iOS 9.2.1 public release comes 2 weeks after Apple seeded beta 2 and about a month after first beta of iOS 9.2.1 was pushed to both developers and public beta testers. iOS 9.2.1, as any 9.x.x update, is minor update, focusing mainly on under-the-hood performance improvements and bug fixes rather than outward-facing changes. The Cupertino based company also release this latest public update a week after it seeded iOS 9.3 beta 1 which brings major new features such as Night Shift to iPhone and iPad that cuts down on blue light exposure during the evening for better sleep and brings new educational features.
How To Install iOS 9.2.1 Firmware Public Update On iPhone
Before you will proceed note:
If you are jailbroken on iOS 9.0-9.0.2, it is vital to know that for now there is no public jailbreak released for iOS 9.1+ devices. So if you want to keep all installed Cydia tweaks you should stay away from iOS 9.2.1 until a jailbreak tool is made available for iOS 9.1, 9.2 and 9.2.1firmware versions.
If you don’t care about jailbreaking though, you can update your device to iOS 9.2.1 using OTA (Over-The-Air) method. Simply navigate to Settings, then to General option, lastly to Software Update and update directly from there.
In case you don't have enough space on your iDevice you can use clean installation to get iOS 9.2.1update using safe method. You can install the recent public firmware by restoring the IPSW file from iTunes. But before do it, make sure you backup everything before hitting that Restore iPhone button. So use the direct links below to download and install iOS 9.2.1 on iPhone or any other compatible device.