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RootlessJB

Jake James, iOS/Web & tweak developer released a new rootless jailbreak for iOS 11.3.1 to iOS 11.2 versions on iPhone, iPad and iPod touch. This is concept jailbreak called as rootlessJB based on the Ian Beer’s empty_list exploit. However, this rootlessJB does not install Cydia and it allows to run Cydia tweaks only.

Version Compatibility

iOS 11.3.1, iOS 11.3, iOS 11.2.6, iOS 11.2.5, iOS 11.2.2, iOS 11.2.1, iOS 11.2

Device Compatibility

iPhone X, iPhone 8 & Plus, Phone 7 & 7 Plus, iPhone 6S & 6S Plus, iPhone 6 & 6 Plus, iPhone SE, iPhone 5S
iPad Mini 2, iPad Mini 3, iPad Mini 4,iPad Air, iPad Air 2, iPad Pro
iPod Touch 6G
Compatible Cydia tweaks with RootlessJB jailbreak
DarkMessages
CallBlocker
Cylinder
CustomCarrier
DopeSettings
Dummypass
FloatyDock
HomeGesture
You can install following Cydia Tweaks once you installed rootless jailbreak for iOS 11.2 to iOS 11.3.1 running iOS devices.
IconRenamer
LittleX
Silo
StatusHUD 2
System Info
XBarRemover
Zeppelin
RealCC

Step Guide for RootlessJB

Step 01 -  Download the IPA file from the following link.
Step 02 -  Download Cydia Impactor from the official site according to your computer OS.
Step 03 - Launch Cydia Impactor and drag & drop the downloaded IPA file on Cydia impactor.
Step 04 - Provide your Apple ID email and password to sideload the IPA to your device. Now you have installed IPA app to your device.
Step 05 - Open the app. Click on Jailbreak! to start the process.
RootlessJB App
Step 06 - Once complete the process you can install tweaks using Filza on your iOS 11.3.1 - iOS 11.2 running device.
How to install Cydia tweaks on iOS 11.3.1 - iOS 11.2  with RootlessJB?
You must install the following two apps to install the Cydia tweaks with RootlessJB.
Filza
Filza provide full root access to all the files in the directory. 
Filza IPA
ZipApp Free
ZipApp is an default iOS app which is a help to unarchiving & archiving file in various other formats on your iOS Devices.
ZipApp free
Once you installed the above apps, you can install Cydia tweaks manually using the below guide.
Step Guide
Step 01 - Download any DEB file you want to install. 
 
Step 02 -  Open the Deb file using ZipApp Free app and extract the data.tar.Izma file in the archive.
Step 03 - Open Filza  app and navigate to /var/mobile/Containers/Data/Application. Sort this folder according to date and check the latest one that contains the tweak files.
Step 04 - Copy <tweak name>.plist and <tweak name>.dylib files to the /var/containers/Bundle/tweak support/usr/lib/TweakInject/ folder.
Step 05 - Now you must restart your device. This step is essential to inject tweaks and If not your tweaks will not be loaded.