If you've jailbroken on iOS 11.2-11.3.1 using Electra and want to reverse the process, here's how you go about doing exactly that. You can use ElectraRemoverVFS which is the Electra Jailbreak Remover Toolkit to remove the jailbreak for iOS 11.2 - 11.3.1 and keep your data intact.
Download ElectraRemoverVFS For Free
First of all you need to install Panda Helper to get ElectraRemover on your Device,because you can't get ElectraRemover from the iOS app store.
Step 1: Open Safari and go to Panda Helper official website
http://m.pandahelp.vip/?s=gg or Scan QR code
Step 2: When the website is loaded, tap on the “Regular” option, There you can see “Download Free Version” button, tap on it.
Step 3: When prompted, tap Install to confirm.Wait for a few seconds to download the app.
Step 4： Once done, go to your device's main Settings > General > Profiles & Device Management and trust the profile that belongs to the Panda Helper app.
Step 5: Now launch Panda Helper, search for ElectraRemoverVFS and install it.When you open it at first time,if you see the “Untrusted Enterprise Developer”message again.Just go to the Settings app and trust the profile belonging to ElectraRemoverVFS like you did with Panda Helper.
Step 6: Now ElectraRemoverVFS is ready to remove jailbreak.
How To Remove Electra iOS 11 Jailbreak
Step 7: Run the ElectraRemover application from your home screen.There you can see "Remove Jailbreak" button, tap on it.Once done, the device will respring and Revert to the state of no jailbreak.