In the present iOS 8.3 software, Apple has fixed a total of 39 different security flaws including the one that involves the (CVE-2015-1087) TaiG jailbreak. For those who are not aware, this is the jailbreak team that rubbished all rumors related to the iOS 8.2 jailbreak. In a public announcement that took place last December, the team suggested that they would update the jailbreak support designed for iOS 8.2 once the update has been made public by Apple. However, if you are looking for a jailbreak announcement in the near future, you might have to downgrade to a lower iOS version.
Presently, there is no jailbreak available for either iOS 8.3 or iOS 8.2. However, if your device is running on a much older iOS 8.1.2 version, you need to make use of the untethered jailbreak tool developed by TaiG team.
The downgrade will be supported by the following devices running iOS 8.3:- iPhone 6, iPhone 6 Plus, iPhone 5s, iPhone 5c, iPhone 5, iPhone 4S iPad 4, iPad 3, iPad 2, iPad Air 2, iPad Air iPad mini 3, iPad mini 2, iPad mini with retina display and iPod touch 5G. However, you should follow certain steps in order to make sure that the downgrade process goes smoothly. Firstly, before you downgrade your IPSW firmware, you need to create a backup of all data like that of photos and other stuff to iCloud.
You can also back them up in your PC. You can avail the full backup option in iTunes and iCloud, but it won’t work in case the backup made on iOS 8.3 was for an older version like iOS 8.2. In the next step, you need to download iOS 8.2 IPSW to your iOS device. You must ensure that you have downloaded the correct IPSW firmware depending upon the model number of your device. Keep in mind that installing incorrect firmware can damage the iOS device. Be patient as downloading it will take some time.