In this case, you can you run the following to remove completely you previous Liferay installation:
sudo /opt/bitnami/ctlscript.sh stop
sudo rm -rf /opt/bitnami/
About the rest of issues, let's try to go through them one by one.
What exact issue are you facing in the server with this bnsupport-ID? Which exact steps did you follow to reproduce this issue?
Note that we don't provide support about Mobile Devices Detection since we don't know about this solution, and in case the issues are related to this, I would suggest you contacting their developers instead.
Regards and Happy New Year