Samsung S7 speaker phone not working (at all) My Samsung s7 (SM-G930F) works for making calls on 'normal' (non speaker phone) mode in all apps. but whenever i switch to speaker phone (regardless of the app i am using) the other side (the person I'm calling) can't hear me anymore. As soon as I switch to non-speaker-phone mode the other side can hear me again. It also doesn't work in video calls (the other side can't hear me when video calling). 

Note: voice recorder also works just fine..
Note2: with headphones installed (via headphone jack) it also works (other side can hear me just fine)

I've tried the following:


reset to factory settings
clean microphone/speaker port+holes
checked microphone connector (if it was properly installed, it is)
cleared cache partition in android recovery menu (no change)
tried it in safe mode (problem persists)
and countless other 'fixes' which unfortunately did not work for me...


I have a custom ROM installed (I tried to find something as close to the stock ROM as possible). I previously had Lineage OS 16.0 Herolte installed but on that ROM Roaming did not work so that's why I decided to install a different ROM. Currently installed ROM I am not 100% sure of, will check tonight. I believe I followed this video tutorial so I should have the android 8.0 ROM installed from sammobile.com: https://www.youtube.com/watch?v=LvPL6hskf6w. On the current ROM Roaming does work.

I believe the current ROM causes the issue since speaker phone was working on lineage OS previously. 

Are there any other fixes/tests I could try to determine/fix the issue?

Any recommendations on where to find/download stock Android 8.0 ROM for the SM-G930F?

Thank you!
Dunno about the fixes, but since you also asked for a ROM, here it is