Download iOS 12.5.5 (16H62) IPSW for iPhone 6 Download
This firmware is signed. This means that you can restore to it in iTunes.
iOS 12.5.5 Release Notes
Please note, the documentation below is supplied from Apple’s update servers. We don’t modify the contents of this documentation.
This update provides important security updates and is recommended for all users.
For information on the security content of Apple software updates, please visit this website: