How to install iOS11
Method 1 (Configuration Profile update via OTA):
Step 1: Download the Configuration Profile on your iDevice that we’ve sent you via email.
Step 2: Allow it to install on your iOS device
Step 3: Once the profile is set, head to General > Settings > Software Update on your device and wait for iOS 10 beta OTA update to show up.
Step 4: Once it is available, tap on Download and Install to get onto the new firmware version.
Method 2 (iTunes-restorable firmware download method):
Step 1: Connect your iDevice with iTunes via USB.
Step 2: Restore your iPhone, iPad or iPod touch to iOS 9.3.2 via iTunes, then setup it as a new iPhone
Step 3: Download iOS 10 Beta for your iPhone, iPad or iPod touch
Step 4: Now your are requested to hold SHIFT and left click on “Check for Updates” on iTunes, then select iOS 10 beta which you downloaded on Step 3, wait for few minutes and enjoy iOS 10