Keep in mind that, like the developer preview, this release won’t be bug-free (beta version), though it will likely be more reliable. Still, it may not be the best choice if stability is top of mind for you. One more thing your device will need to be compatible. If you own an iPhone 5 or earlier, you’re out of luck sadly.
Compatible iOS devices:
iPhone 7, iPhone 7 Plus, iPhone 6s, iPhone 6s Plus, iPhone 6, iPhone 6 Plus, iPhone SE and iPhone 5s 12.9-inch iPad Pro, 9.7-inch iPad Pro, iPad Air 2, iPad Air, iPad 5th generation, iPad mini 4, iPad mini 3, iPad mini 2, iPod touch 6th generation
Follow these Steps to Download & Install iOS 11
Step 1 Go to https://developer.apple.com/programs/ and register yourself. Step 2 You’ll be asked to enter Apple ID. Use your Apple ID to login to the Account. Step 3 Register with Apple your UDID for the device that the iOS 11 beta will be installed on. Checking UDID; Plug your device into iTunes, choose it, and then click serial number to see UDID. Copy it. Step 4 From “Account” section, click “Certificates, Identifiers & Profiles” In the left, there will be a “Devices” section. Click “All” from this section. Click “+” from the right hand panel, then add your UDID. Step 5 After adding UDID, go to “Develop -> Downloads” section. This page available at this URL: https://developer.apple.com/download/.
Step 6 Choose your device form the drop down menu to download iOS 11 iPSW firmware file. You can also take the OTA route for downloading firmware. Open downloads page as above on your iDevice, click “Download” beneath iOS 11 beta beside “Configuration Profile”, and wait for it to install on your iDevice. After setting the profile, go to “Settings > General > Software Update” on the phone and wait for OTA update for iOS 11 beta to show. Tap “Download and Install” to get it done. Step 7 Go back to iTunes-restorable firmware download section, ensure the latest version of iTunes is there on your PC. Launch iTunes and connect iDevice to PC. Step 8 Install beta using “Shift” if you’re using Windows or “Alt” if you’re using Mac and select “Restore iPhone.” Now iTunes will ask you to choose “ipsw” file. Choose the iOS 11 beta file downloaded before. That was the final step. You now just have to wait for iOS 11 beta to be installed on your device. To install iOS 11 without Apple developer account, drop a comment.
