After more than 15 years covering everything Apple, it’s with a heavy heart we announce that we will no longer be publishing new content on iMore and the iMore forums will be closing as of November 1st, 2024.
Welcome to iMore! As of right now Apple is still signing iOS 9.3.5 so it's possible to install it through iTunes if you can find the .ipsw file. I can't imagine that door will remain open much longer though.