I am currently trying to find any vulnerabilities in a TP-Link router bu don't know what my next step is. I have experience with reverse engineering different types of binaries in CTFs but reversing the firmware of a router seems like a whole different beast.

I was very fortunate to acquire a TP-Link router that is almost identical to the router used in this video by the Flashback Team ( Check them out if you haven't already they are really good at explaining the basics of UART serial communication and other cool reverse engineering projects ). They are very experienced an have written scripts that automatically find vulnerabilities focused on system calls but how do they write these scripts and what is an example of a similar script?

They also focused on the tdp server on port 20002 with udp protocol. I assume they extracted that processes software and reverse it's binary but what I did is extract the entire root file system. Is it better to just extract a specific process? If it is how do I go about finding what processes are good attack vectors and potentially with have a vulnerability?

This is my first time reverse engineering in the real world everything else have been done through various CTFs so anything in appreciated. Thank you for your responses!

P.S. I am new to reddit as a whole and did not know what to do with the Link.