To do Writeup
Hacktivitycon 2021
Solved by: Starry-lord
De-compile the app
I personally used https://www.decompiler.com/jar/62e31f7faaf148b1b1c4fd143e5480c1/todo.apk/sources/com/congon4tor/todo/LoginActivity.java
Find password “testtest”
Login to the app and find to do list along with the flag