We're getting closer and closer to a final iOS 11.2 release for everyone. Apple just pushed out beta 5 for iOS 11.2 to developers and public testers on Tuesday, Nov. 28, and much like its predecessor from a few weeks ago, there's not much included but bug fixes and security patches.
To get the latest beta update, you just need to follow the steps in this tutorial. What's new in iOS11.2 beta5?
You're suggested to back up your iDevice first, just in case.
Step1: Connect your iDevice to PC using the USB cable and launch 3uTools on your PC.
Step 2: Click "Flash & JB" -> "Easy Flash", then select the firmware iOS 11.2 beta5, finally click "Flash". (If you want to save iDevice's data, you need to select the checkbox that "Retain User's Data While Flashing")
Step3: Keep a good connection between iDevice and PC, and then just wait patiently till this process is finished. The whole flashing process needs 5~10 minutes in general, when it's finshed, then you can experience iOS 11.2 beta 5 freely.