This can come in very handy when you want to sell your device, as it allows you to remove the data and all your personal data without having to restore your device.Since restoring your device would mean installing the latest i OS software update, Cydia Impactor gives you the option to remain at the i OS software update that can be jailbroken, which can be very valuable.If you have developer account, you can easily download and install i OS 11 beta to try out the newest i OS version. Don't worry mate, you can still install i OS 11 beta 7 on your i Phone or i Pad even without the developer account. After your i OS device has rebooted, launch Settings app on your device → Tap on General. Note: at times, the beta profile may take some time to appear. Just in case, it doesn't show up, you need to reboot your device. Tips to solve the problem)Now, download and install the i OS 11 beta as usual.
Sometimes a person's schedule doesn't allow for the transition right away.There are several tools such as i LEX RAT, a command line tool, and Semi-Restore, a desktop tool that allow you to restore your jailbroken device without losing the jailbreak.But as saurik points out, Cydia Impactor has a different objective.It is normal and common to test an i OS 8 app on an i OS 9b5 device. Sorry I don't know much about compiling / beta relationships.And it's normal to see things break in such a situation. This way I can put out an update to my existing app that will work on the new version of i OS without the need to update everything.