Yalu (formerly Yalu + Mach Portal) was the first jailbreak for iOS 10 released on December 21, 2016, by well-known hacker Luca Todesco, famous by his Twitter handle qwertyoruiop. The Yalu jailbreak made use of Ian Beer’s, of Google Project Zero, mach_portal exploit. It supported select 64-bit devices such as the iPhone 6s, iPhone 6s Plus, iPhone 7 and iPhone 7 Plus.
Todesco then released a more stable version of the Yalu jailbreak tool for iOS 10.2 by using Ian Beer’s, extra_recipe exploit with the help of Marco Grassi on January 26, 2017. It supports all 64-bit devices except for iPhone 7 and iPhone 7 Plus.
You have to use a computer application known as Cydia Impactor to install the Yalu jailbreak. The jailbreak is a semi-untethered jailbreak, which means that when the iOS device boots, it will no longer have a patched kernel. You are required to run the Yalu app again, to re-jailbreak your iOS device. The other limitation of the jailbreak is that the Yalu app certificate expires seven days, so you have to reinstall it again using Cydia Impactor to renew it for another 7 days.
Yalu Jailbreak works with the following iOS devices on iOS 10.2 – iOS 10.0.1: