Restore your device from a backup using iTunes or iCloud.
You will see a number of recomendations.
Settings > General > iPad or iPhone Storage.
Now again check current system storage to see if it is reduced.
Now just wait, you do not need to do anything else.
Follow the onscreen tips, like entering your passcode or tapping “Trust This Computer”.
Connect your device (your iPad or iPhone) to your computer (Mac or PC) via your USB cable.
Open iTunes on your computer (make sure that you are running the latest version of iTunes).
These steps will trigger a maintenance which may reduce the size of system storage:
You may want to try the following steps.
In fact, when I restarted my iPhone system storage went down from 13.17 GB to 11.87 GB. Restarting your device will highly likely reduce this system storage.
The first thing you should try is to restart your iPhone or iPad.
But if you are low on storage and if you think that system is taking up a lot of storage, you may want to try the following tips: Usually this is normal and again usually you should not worry about system storage if you still have a lot of free space. To check your device’s current “System” Storage size, on your iPhone or iPad, go to Settings > General > iPhone or iPad Storage > and scroll down: This guide explains how you can reduce “ system” storage size on your iPhone or iPad. System storage consists of two type of files: (a) system files that are necessary for operating the core system of the device and (b) temporary system files: system settings, backups, logs, caches and other files.