If moving from i OS 10.2.1 to i OS 10.2, you will not be able to restore a 10.2.1 backup to your device on 10.2, so make sure you save anything you want now.If you’re one of the many users updating to i OS 9 today, you may have come across a rather frustrating error message stating “Software Update Failed.Now, in this guide, we will show you two common as well as simple ways to enter DFU mode. This way is used more often among i Phone users to recover their i Phone. Release "Power" button after seeing the Apple logo on your device, but keep holding "Home" button. In this guide, we’ll talk you through how to upgrade/downgrade to i OS 10.2 from a lower/higher firmware, if you are one of the people who should be there. Everyone else should check out my advice for all devices on all firmwares to find out if you need to stay where you are, or move to i OS 10.2.Everyone on i OS 10.2.1 or i OS 10.3 beta who wants to jailbreak, now or in the future. 1) Ensure you have backed up your device to i Tunes and/or i Cloud before beginning.The solution to this “Software Update Failed” error message? Or, if you have no patience at all, you can use manual firmware updates… To elaborate, tap on the “Close” button to close the error message, then wait a few minutes before tapping on “Download and Install” again.
Some people on a lower firmware should also upgrade to i OS 10.2, but not everyone. If you have an i Phone 7 or i Phone 7 Plus and are on lower than i OS 10.2, do not update to i OS 10.2, stay on a lower firmware!
Using IPSW is often considered advanced but it’s actually pretty easy, just follow along with these directions and you’ll be along your way.
You can use IPSW files on Mac or Windows, both require i Tunes to work properly.
I backup to i Tunes with ‘Encrypt Backup’ selected, to make sure I have a hard copy on my computer which also contains all my app passwords and email account details.
Manually save any other data off your phone that you may want, such as your Camera Roll.