Before, proceeding with the upgrade you have to be aware that there currently isn’t any i OS 11 jailbreak available.
Updating your device to i OS 11 will instantly wipe your jailbreak along with all the tweaks that you installed on your i Phone, i Pad or i Pod touch.
This means all tweaks and customizations will be erased and stock i OS 8.1.1 installed.
Before jailbreaking i OS 8.1.1 with Tai G it is recommended to install a clean copy of i OS 8.1.1 using i Tunes.
To get this upgrade, you are required to download a suitable app. Using Pangu jailbreak app, you can Upgrade Jailbroken i Phone to i OS 10 as outlined below. On your i Phone, launch Safari web browser with i OS 10 firmware running. You need to ensure that you are connected to the computer which has i Tunes. The following steps show how you can extract data from your i Phone by using i Cloud backup. i Cloud will successfully backup your data within a very short time.
You always have to ensure that your battery has enough power while the backup process is in progress.
With i Skysoft Toolbox - i OS Data Recovery, you can fetch back your data safely and with ease.
This is a very effective tool and it is worth using it.
Connect the device to a computer and restore to i OS 8.1.1.If you attempt to upgrade a jailbroken i Phone / i Pad, over-the-air, from the Settings app your device will remain stuck on the on your Mac or Windows computer and plug-in your i OS device with the help of the Lightning cable. Click on your device’s icon as soon as i Tunes recognizes your i Phone / i Pad. Select the “Check for Update” option and allow your computer to inquire Apple’s server for the most recent i OS 11 firmware. You'll lose the jailbreak and need to re-jailbreak (if one is out for the update), but there are some settings that stick around after updating (! For example, I had installed a 5-row keyboard hack, and after updating, my keyboard was dead-on-arrival (it would not appear).You can either extract all files or just of your choice.When the file selection is complete, click on “Export to Mac” button to make the process complete.The steps followed when using i Skysoft Toolbox - i OS Data Backup & Restore to back up files from jailbroken i Phone is outlined as follows: Step 3: The scanning process will begin and when it is done, the results are displayed in the preview window.