In this article, iLounge will guide you on how to uninstall iOS 13 beta. I recently upgraded my iPhone 7 to Apple's new iOS 13 beta. Since it had too many bugs, I had to uninstall it from the device and downgrade back to iOS 12.
While searching for some methods, I found a great video that helped me get it. The steps given in the video are very simple. The video can be found below.
Uninstall iOS 13 beta