Apple has released the first software update to iOS 11 with iOS 11.0.1 for iPhone and iPad. The build comes in at 15A402 (or 15A403), up from 15A372 for iOS 11.0.

iOS 11.0.1 is available on 3uTools now, please kindly check update on 3uTools. Here's how to install iOS 11.0.1 using 3uTools. Before you upgrade, please remember to back up your iDevice on 3uTools in case you lose your data.

Step 1 Launch the latest version of 3uTools and connect your iDevice to your PC with USB cable. 

Step 2 Click Falsh & JB -> Easy Flash, and select the iOS 11.0.1 firmware. If you want to save the data, please select the option "Retain User's Data While Flashing" and then click "Flash".

Step 3 Keep a good connection between your iDevice and your PC and wait patiently till the process finishes. Your iDevice will reboot automatically after that.

Step 4 Now you could enjoy iOS 11.0.1 on your iDevice.