tl;dr: it was a bomb-like challenge where you needed to pass each check. [https://blackbeard666.github.io/pwn_exhibit/content/2020_CTF/HackLuCTF/rev_flagdroid/flagdroid_writeup.html](https://blackbeard666.github.io/pwn_exhibit/content/2020_CTF/HackLuCTF/rev_flagdroid/flagdroid_writeup.html)