Can I downgrade from iOS 11 developer beta? I'm not worried about data preservation
Yes! You can always downgrade from iOS developer beta to stable version signed by Apple. Just follow these steps and you are good to go!


First of all make sure you have latest version of iTunes if not
update your iTunes to latest version.
Then you have to download stable iOS file for your device. Use this website to download appropriate version (10.3.2) for your device. 
Turn of find my iPhone feature by going to Settings on your phone.
Connect your device to computer and put your device in recovery mode. If you don't know how to put your device in recovery mode just google it or search it on youtube you will find tons of videos. 
Once your device is in recovery mode iTunes will pop up letting you know your device is in recovery mode. Press and hold the OPTION key if you are using Mac or SHIFT key on Windows and click on Restore iPhone .Browse the firmware you downloaded. 
Now sit back and relax your phone will be restored to iOS 10.3.2