Rating: 5.0

https://github.com/vsnrain/ctf-writeups/tree/master/2018/matesctf/jailbreak

tictactoe – June 28, 2018, 11:24 a.m.

Congratz, I'm the author of the challenge. Great writeup btw.
You can read the btnChecked function statically, then by knowing that it called 2 testFunction, you can use frida to change the return value of one of those two. It will give you the flag.