I’ve gone through 4 bottom modules in since 2016 because the primary microphone would break. This last one was done after only 1.5 months.
Now I noticed that there is weird residue on the bottom module as you can see in the picture. The other side of the module as well as the rest of the phone looks normal.
Do you have any idea what that is or if it could have something to do with my constantly breaking microphones?
Thanks in advance!