Settings I use for skvalex call recorder:
Gerät (Device): Qualcomm SDMxxx
Standard API> Audioquelle (Audiosource): Sprachverbindung (Voice connection? not sure about the correct translation)
Thanks for your feedback, and I'd like you ask a favor from you guys who is on 9.0.
Try that Cherinbo app and confirm that it's working good. I'll buy you a coffee if I could. ;)
I wanted to give it a try, but I can't use it unless I give pe...
Well, I can confirm the paid verision of CallRecorder from skvalex still works on my Oneplus 6 with 9.0 Pie (not rooted, yet)
Just follow this guide and your problems will be solved: https://www.reddit.com/r/nexus5x/comments/5hj0r0/bootloop_after_lg_replaced_mainboard_bootloader/
Have you checked your headphone jack for dust? I had lots of dust in mine. I carefully got rid of it using a needle. This at least helped to get rid of the problem, that it just sometimes recognizes the headset.
About the mic: try a service test:...