Background story is that during firmware update of a generic IP Camera, with great wisdom, I managed to wipe part of the embedded Linux files, and in order to recover it, I need to access the bootloader through serial.
The PCB has no special identification, except for the strings "MP-3.4" and "1238" on the board itself.
First I looked for the J2 label, which from my understanding usually means JTAG or Serial port with this kind of generic camera.
My first suspicion laid upon the 4 connections at the top left corner of the top view:
I measures 3.3v between the two adjacent right pins, but the two to the left did not provide any output, and the Serial to USB adapter I am using remained silent.
I can identify all the chips on the board, as someone else with the same board described here, but could not find any schematics for it that would direct me to the Serial pins.
Do I have a better option other than brute forcing every pin that looks like it's not connected to any component? Is there some kind of best practice to follow when reversing such board? Anyone has any experience with this board?..