We’re not quite ready to officially support two receivers on one Raspberry Pi yet. We’re not pushing 3.7.1 updates either. If you want to upgrade go to your stats page, click the gear icon in the top right of the page and send the device command “Upgrade and restart PiAware”.
Finally, if you want to switch to 978 there’s instructions on how to do that here: Announcing PiAware 3! (Latest version: 3.8.0) - #994 by esmathews