Apple is releasing iOS 12.2 beta 5 for iPhone and iPad today. The latest beta update should be released over-the-air at the top of the hour. Apple also released the fifth beta versions of watchOS 5.2, tvOS 12.2, and macOS 10.14.4 today as well. You can experience it in Easy Flash of 3uTools, here is the guide.
Step 1 Connect your iDevice to PC with USB cable and launch 3uTools.
Step 2 Navigate to Flash & JB → Easy Flash, and select iOS 12.2 beta 5 firmware. After you click Flash, there will be a popup reminder and please read it with caution. If you want to save your data, please check the box "Retain User's Data While Flashing".
Please back up your iDevice regularly just in case.
Step 3 Keep a good connection and internet while flashing, wait patiently for around 5 to 10 minutes. Your device will be restored to iOS 12.2 beta 5 after reboot.