When the latest jailbreak dropped Saurik re-branded “Cydia impactor” as “Cydia Eraser”, Cydia eraser allows users to remove the jailbreak files from your device and returning you to stock iOS without being forced to updated to the latest version of iOS.
Today Saurik has updated Cydia Eraser to fully support iOS 9.3.3, however there are reports of this tool not working on OTA (Over The Air) updates, so we recommend that users who did an OTA update check if iOS 9.3.3 is still being signed and if so restoring fresh to iOS 9.3.3 and then re-jailbreaking.
Cydia Eraser works with both the Chinese and English version of the jailbreak. Part of the Cydia description advises all users to back up their device before using the tool:
Running this tool will destroy all of your data: this is the goal. Do not run this unless you want to destroy all data.
(So, you should make a backup first. After using this tool, you will have to re-activate your device. If you are logged in to iCloud, you will need to have your Apple ID password to get access to your device after it reboots.)