Piaware for new RPi 3B+

This sounds like a blacklist issue.
Check out this post

I am running two 3B+'s without an issue.

You should be able to install the image in a 3B(not plus) or older. Do this
sudo apt-get update
sudo apt-get dist-upgrade
sudo rpi-update (Maybe)
then this image should work in a 3B+

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