Step 1: Open the package manager on your jailbroken iPhone and add this repo: myxxdev.github.io. Then, proceed to install the MyBloXXX tweak from it.
Step 2: Install the iOS developer profile linked in this Reddit thread on your iPhone.
Step 3: Check for an iOS update on your device. If you followed the steps properly, the iOS 14.3 OTA update should show up on your device.
Step 4: Use the Restore RootFS option in Unc0ver, Odyssey, or Checkra1n jailbreak app. Now, proceed to install the iOS 14.3 OTA update on your iPhone.
Step 5: After the iOS 14.3 update is installed, you can erase all contents on your iPhone and then jailbreak it using Unc0ver or Taurine.
If you had been holding out on iOS 13 – iOS 13.7 or <iOS 14.3 because of your jailbroken setup, this is your chance to upgrade to the relatively latest build of iOS 14 while still being to jailbreak it. The above method is only expected to last until April 19, so make sure to try it out as soon as possible.
Update: The method does not seem to work on iPhone 12 and other A14 devices. However, it is confirmed working on other older iPhones and iPads.
Author: Rajesh Pandey