Known Issues
Updating from iOS 11 beta 5 to beta 6 or later may stall indefinitely. If the progress bar on the Settings > General > Software Update pane stays full for more than a few seconds without showing the Install dialog, use the workaround below.
Workaround: Follow these steps to delete the software update and then reinstall the new beta:
1. Open Settings > General > iPhone Storage.
2. Select the iOS 11 Developer Seed causing the error and press Delete.
3. Open Settings > General > Software Update and download the the update.
* Important: Stay on the Software Update pane until the update is ready to install.
4. When prompted, install the update.