https://www.imore.com/how-download-ios-13-public-beta
How to download iOS 13.6 public beta 3 to your iPhone | iMore
Jun 30, 2020 - Looking to try out iOS 13.6? The third public beta is now available. Here's how to download it!
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https://appleinsider.com/articles/20/09/09/apple-halts-ios-1361-code-signing-following-ios-137-release
Apple halts iOS 13.6.1 code signing following iOS 13.7 release | AppleInsider
Apple on Tuesday ceased signing code for iOS 13.6.1, effectively barring users who updated to the latest iOS 13.7 operating system from downgrading.
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https://www.bgr.com/tech/ios-16-7-macos-13-6-and-macos-12-7-fix-exploited-vulnerabilities-by-attackers-update-now/
iOS 16.7, macOS 13.6, And macOS 12.7 Fix Exploited Vulnerabilities By Attackers; Update Now
Sep 21, 2023 - If your device can't run iOS 17.0.1, Apple is also releasing iOS 16.7, macOS 12.7, and macOS 13.6 to older iPhones and Macs.