As long as Apple continues to sign the previous versions of iOS 11, the version downgrade can be done easily and simply, so you can try this new version iOS 11 public beta just released by the Cupertino guys and then Get back to iOS 10.3.2 with a few simple steps.
All beta versions, whether they are developer or public, allow you to go back to previous versions and in this case if you have noticed those bugs too much or you have already tired of being in the beta version, you can return to iOS 10.3.x easily thanks to iTunes , Yes indeed, requires a backup prior to beta installation.
Once we have our iPhone or iPad in the public beta version of iOS 11 it is easy to return thanks to iTunes. The first thing we have to check is that we have the latest version of iTunes installed on our Mac or PC and use the original iPhone or iPad cable for the process. With these two elements very clear we begin the process.
We connect the iPhone or iPad to the Mac and holding down the buttons "start" and "power" (iPhone 7 / iPhone 7 Plus with power button + volume down) we hope that the apple logo appears and leaving it pressed until we have the Recovery modewhich is the iTunes icon and the cable.
Now we have to press on the Mac / PC in the option to Restore iPhone or iPad and deactivate, Find my iPhone if we had it active through the Apple ID and password. Once the restoration process is done, it will ask us if we want to restore an old backup or configure the iPhone / iPad as new, we choose the backup that we mentioned at the beginning, install and go.
The truth is that it is very easy to go back and leave the iPhone or iPad in the current version again, we simply have to be careful every time we install a beta to make a previous backup in case we have to return not to lose the data of the idevice. In any case, in the worst case scenario it would be precisely that we would lose all the data and it would be necessary to configure as a new iPhone or iPad.
[UPDATED]
Some users would be having problems to download the version of the iPhone and this is solved with the iOS 10.3.3 beta download. In this case what we have to do is put our iPhone in Recovery Mode and first install the beta of iOS 10.3.3 which we can download from this same link, then we can download to the iOS 10.3.2 version loading our backup on the iPhone.
To install the IPSW file in which iOS 10.3.3 beta will be saved, what we have to do is with Recovery mode and connected to the Mac, press the ⌥ (Option) or Shift key in the case of using a PC and in Restore from iTunes. The dialog box to install the downloaded version in IPSW will appear. We chose the beta iOS 10.3.3 and installed on the iPhone. Then we can do the above procedure to install iOS 10.3.2.
It worked for me perfectly. Thanks!