*AHEM
“In early 2017, Luca and Marco Grassi updated Yalu with another exploit, adding support for iOS 10.2. This updated tool is called yalu102 and can be used now to jailbreak all non-iPhone 7/7 Plus 64-bit devices on iOS 10.2. Like Mach_Portal + Yalu jailbreak for iOS 10.1.1, the yalu102 10.1.1-10.2 jailbreak is semi-untethered in nature.”
I bolded the part about it being tethered - which means every reboot causes a loss of the JB.
Per Redmond Pie - a site you would know if you knew anything about Jailbreaking iOS devices…which it sounds like you don’t (LOL).
Shesh