Due to the process that undergoes when you update your software, the device would tend to increase its internal temperature. A notification will that says, “(the device you are using) needs to cool down before you can use it” during the update.
How to fix iPhone / iPad Overheating issue in iOS 11 Beta:
- The safest and most ideal solution is to literally allow your device to cool down itself first before using it again. Once you do, you can try to update it again.
- If your device’s GPS location is on, disable it. It is normal for a device to increase its temperature when it is being tracked. To disable it Settings > Privacy > Location Services > Switch Off.
- If you are using any kind of protective case, it will help if you remove it first.