The third main update to iOS 17 and iPadOS 17 following after iOS 17.2 and iPadOS 17.2 were introduced on December 11, Apple has made iOS 17.3 and iPadOS 17.3 available to download to iPhone and iPad.

iOS and iPadOS 17.3 have build number 21D50, replacing the previous builds, 21C66 for iOS 17.2.1, and 21C62 for iPadOS 17.2.

To update devices to iOS 17.3 manually, users must open the Settings app select General, then Software Update. If the update is available for the device, tap it and follow the on-screen instructions to install it.

You can also upgrade to iOS 17.3 on 3uTools!

iOS 17 is compatible with these devices:

iPhone 15, iPhone 15 Plus, iPhone 15 Pro, iPhone 15 Pro Max, iPhone 14, iPhone 14 Plus, iPhone 14 Pro, iPhone 14 Pro Max, iPhone 13, iPhone 13 mini, iPhone 13 Pro, iPhone 13 Pro Max, iPhone 12, iPhone 12 mini, iPhone 12 Pro, iPhone 12 Pro Max, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone XS, iPhone XS Max, iPhone XR, iPhone SE(2nd generation or later)

♠♠Tips:

1. After upgrading your device to iOS 17.3, even if you have backed up your SHSH with 3uTools, you can't downgrade to an iOS version that "Apple has stopped signing".

2. After upgrading your device to iOS 17.3, if you want to downgrade to another iOS firmware

"Apple hasn't stopped signing", it is not recommended to check the box "Retain User's Data", as it may fail or the device may be abnormal after successful flashing. Customized Backup data is recommended before downgrade. Then select "Quick Flash Mode" after customized backup. You can Customize Restore the data after successful flashing.

Step 1 Connect your iDevice to your PC with an original USB cable and launch 3uTools. 

Step 2 Go to Smart Flash > Easy Flash, and select firmware iOS 17.3. There are 4 modes to choose. If you want to update with data, please check the "Retain User's Data" box. There will be a pop reminder after you click "Flash", please read it with caution.

♥ You are recommended to back up your iDevice regularly in case of data loss.

Step 3 Keep the stabilization of network and USB connection while flashing, wait patiently for around 5 to 10 minutes. Your iDevice will be updated to iOS 17.3 after reboot.

Step 4 After the iDevice is turned on, tap "Auto activation", and "Skip setup". You can also manually activate the iDevice, if it is a Retain User's Data flash, you do not need to activate it.