Apple seeded first beta of iOS 11.2.5 for developers just a few hours after releasing iOS 11.2.1. Now, both firmwares are available on 3uTools for users to download. 

iOS 11.2.1 fixes Homekit restore sharing as well as autofocus issue some iPhone X, 8, and 8 Plus users experienced after iOS 11.2. And it's not clear what new features will be included in the iOS 11.2.5 beta and why Apple has skipped several numbers to release an 11.2.5 beta. 

Here's how  to upgrade to iOS 11.2.1 / iOS 11.2.5 beta on 3uTools. Besides, you can also OTA update to iOS 11.2.1 on your iDevice.

Step 1 Connect your iDevice to PC with USB cable and launch 3uTools. Highly recommend you to backup your iDevice before you restore to any iOS version. 

Step 2 Head to "Flash & JB" -> "Easy Flash", select the firmware iOS 11.2.1 / iOS 11.2.5 beta. If you want to save the data, select the option "Retaisn User's Data While Flashing" before you click "Flash" .

Step 3 Confirm the good connection between your iDevice and PC, then wait patiently for 5 to 10 minutes till the flashing process is finished. Now, your iDevice is running on iOS 11.2.1 / iOS 11.2.5.