OnePlus 7 Pro Microphone Fix – Finally!!

After changing the secondary logic board I still had the problem of people on the other side of a phone call not being able to hear me properly.

Here is what finally fixed it for me (so after all this, it was a software issue).

Phone info:

• OnePlus 7 Pro (GM1911)
• LineageOS 23

Be safe and always:

• Backup your phone data before rooting
• Make backups of system files before editing them
• After editing system files, make sure they have permissions 644 (rw-r–r–) before rebooting.

What I did:

• Rooted device with Magisk
  • I also tried the mic-fix module, but it didn’t help.
• Installed Total Commander app
  • I had tried several other file managers/explorers, but always had some issues with seeing/accessing/editing system files. TC just worked.
• Edited /system/build.prop (using TC editor)
  • added the following to the end of the file:
    • ro.qc.sdk.audio.fluencetype=none
• Edited /system/vendor/odm/etc/mixer_paths.xml
  • Change the value from 12 to 18:
    • <ctl name="ADC4 Volume" value="18" />
  • Section: <path name="voice-dmic-ef">
    • Change: <ctl name="AMIC MUX6" value="ADC3" />
    • To: <ctl name="AMIC MUX6" value="ADC4" />
• Reboot phone.
• Done.