@johnth one more thing: it seems MikroTik changed the hard_config compression algo at least for this device:
Left is Hap ac3 lte6 kit (ROS6), right is Chateau 12 (ROS7).
I am not sure if this is general ROS7, or only this device. Non the less, due to this, the wifi board file is not loading. Robi recommended to share this with you, maybe the platform driver needs some tweaking? The new scheme is LZ77
MOD: I checked the "hard_config" part of my Hap Ac3 Lte6 Kit with ROS7 + Routerboot6, and with ROS7 + Routerboot7 and it seems the scheme stayed the same (LZOR) before and after the upgrade. So it seems this LZ77 thing is not a general change, although it might be for the "ROS7 only" devices, like the Chateau 12.