Electra Jailbreak for iOS 11.3.1 – iOS 11.2 has just been released. We would recommend waiting for the initial issues to be resolved before trying it. 

However, if you want to take the risk you can follow the instructions below.

Electra jailbreak supports the following iOS 11 versions:
iOS 11, iOS 11.0.1, iOS 11.0.2, iOS 11.0.3
iOS 11.1, iOS 11.1.1, iOS 11.1.2, iOS 11.2, iOS 11.2.1, iOS 11.2.5, iOS 11.2.6, iOS 11.3 and iOS 11.3.1

Compatible iOS devices:

iPhone X, iPhone 8, iPhone 8 Plus, iPhone 7, iPhone 7 Plus, iPhone 6s, iPhone 6s Plus, iPhone 6, iPhone 6 Plus, iPhone SE, iPhone 5s
12.9-inch iPad Pro, 2nd generation 12.9-inch iPad Pro, 1st generation 10.5-inch iPad Pro, 9.7-inch iPad Pro, iPad Air 2, iPad Air, iPad
5th generation, iPad mini 4, iPad mini 3, iPad mini 2
iPod touch 6G

Make sure that you take a complete backup of your iPhone, iPad or iPod touch using iTunes/3uTools.
Ensure that your device has enough battery level for the jailbreak process to complete.

Here are the 5 easy steps you can follow to jailbreak iOS 11.3.1 – iOS 11 and install Cydia using Electra jailbreak on your iPhone, iPad or iPod touch:

Step 1: Enable Airplane Mode

Coolstar has recommended enabling Airplane mode before using Electra Jailbreak. 

Step 2: Disable Siri

Coolstar has also recommended disabling Siri before using Electra Jailbreak. 

Step 3: Reboot iOS device

Step 4: Download Electra Jailbreak and Cydia Impactor
Download the latest version of Electra jailbreak IPA from the official website and Cydia Impactor from here on your Mac or PC. Cydia Impactor is available for macOS, Windows, Linux (32-bit and 64-bit).

Coolstar has released two versions of the Electra Jailbreak:
1. Uses multipath tcp exploit but requires an Apple Developer Account. It is supposed to have a higher success rate. Then we would recommend clicking on the Download (Dev Account) button to download Electra Jailbreak that uses the multipath tcp exploit.

2. Uses vfs exploit but doesn't require an Apple Developer account. Then you should click on the Download (Non Dev Account) button to download Electra Jailbreak that uses the vfs exploit.

Do not download Electra jailbreak from mirror sites, as they could include malware.

Step 5: Install/Sideload Electra IPA using Cydia Impactor
Connect your iPhone, iPad or iPod touch to the computer with the Lightning cable to sideload the Electra IPA file.
Launch Cydia Impactor on your computer. It will detect your iOS device. Drag the Electra jailbreak IPA file you had downloaded earlier on to its UI. Enter the Apple ID and password for your Apple Developer account when prompted, and wait for Cydia Impactor to sideload the signed app on your iOS device.

If you hit any errors while trying to sideload Electra IPA, then check our post.

Step 6: Trust Developer Profile

Once Electra jailbreak IPA is successfully sideloaded. Launch the Settings app, and navigate to Settings > General > Profile(s) & Device Management (in some iOS versions it may just be General > Device Management).
Tap on the entry with your Apple ID under Developer app, then tap on Trust “XXX”. Tap on the Trust button. The status will change to Delete app.
Note: This step is not required if you’ve used an Apple Developer account.

Step 7: Run Jailbreak Process

Launch the Electra Jailbreak app from the Home screen, and tap the Jailbreak button to start the jailbreak process. It will go through 3 stages, the second stage can take a little longer. After the second stage, your device should respring. Please note that on iOS 11.3-11.3.1, the device will reboot twice and Electra will need to be re-run after the first reboot.

After your iOS device reboot’s the first time, you should see Enable Jailbreak when you re-launch the Electra app.

Step 8: Wait for Jailbreak to Complete
After some time, you should see the Home screen. If you launch the Electra app again, it should inform you that your device is “Already jailbroken”.
Congrats, your device is now jailbroken!
Cydia should also be installed on your Home screen. You should be able to launch it and install the jailbreak apps and tweaks. If you don’t see Cydia on the Home screen, then launch Electra Jailbreak and keep trying until it works. You may need to try several times for it to work.
You can also disable Airplane mode and re-enable Siri after your iPhone, iPad or iPod touch has been successfully jailbroken.

Best Cydia Sources/Repos For iOS 11.3 Jailbreak Electra