Your firewall is, as I have seen, only for rooted devices. In the USA, it's illegal to root a device. Even if it wasn't illegal, rooting would immediately end the warranty on my tablet & my Tracfone would lose its service! I skimmed through prior threads on this issue, as well as discussed the issue with a friend. You really need to have a firewall for nonrooted devices! I'm not an up to date geek. More like an obsolete one lol Rooting devices is both too complicated & complex a process for this old gal!
While I understand the potential need for a firewall to have root access, you need to offer a version for nonrooted devices!
What I don't get is why there's not a version of a firewall on the free version! Granted this is for android devices, not computers, but part of the reason I chose avast was due to my history of using free avast on computer which had a decent firewall!
