I purchased an external 3.5mm microphone about two months ago, and it was working wonderfully (much better audio than internal mic (albeit mono). Two days ago, no microphone input was working (external or internal phone). Today I did a factory reset out of frustration (hey, I need a working mic), and now the phone mic works as normal, but the phone no longer recognizes the 3.5mm mic. When I plug in the Sony noise-cancelling earphones, the audio and speakers work from the earphones, but when I use the 3.5mm mic, the phone doesn't even notice anything is plugged in. Any thoughts/suggestions?

EDIT: I should mention I'm on Lollipop 5.0.2, if it makes any difference. 23.1.A.1.28

I didn't check an MD5 yesterday and now my phone will not boot after flashing. Downloaded Smart Switch , but it is not recognizing my s6. I read somewhere that USB debugging has to be turned on, but how can I do that without a bootable ROM? What am I missing here?