Problems with speaker and unvoluntary pop-ups

Hello, I have a question about the OS. I have a FP3 and I installed the un-googled version (with help from a friend). Installation went well initially but now I do run into a couple of problems.

  • The speaker (hands-free) does not work any more. Assistance of FP says they cannor help because I changed the OS and have to turn to for help.
  • I do not know how to make a back -up, not using a google account, in case I have to reset to manifactur reset.
  • Sometimes the phone has strange pop-ups, and opening and closing of screens (unintentional) after which it switches to a black screen.
    Where can I find the help I need??