Did you run update script with sudo? If yes, please remove /home/pi/.openauto/config/openauto_equalizer.ini and execute update script once again without sudo.
check whos the owner of "openauto_equalizer.ini" and "default.pa" files.
Had the same problem because it was root owner. Changed both files to PI owner and problem solved.
Or you could probably just do "sudo chmod +x" to both files (that makes the file read/write/modify for all users - root, pi, guest).
Raspberry Pi 4b-4gb / Official 7" touchscreen / OAP 5.0 / Honor 8x (AndroidAuto 5.) / USB sound card / USB microphone