Sorry for the late reply, it’s busy around here.
It’s hard to speculate as to what the issue may be as the device could simply be defective; or it could be a case of a bad power supply.
My guess would be the latter. You could power Vero with a USB cable (with the PSU removed) temporarily or a test. I’m happy to send you a new PSU as well for you to give a go.
About the resolution not supported message; should be fixed in next update. You can try it now with:
- Login via the command line
- Edit the file
- Add the following line:
deb http://apt.osmc.tv stretch-devel main
- Run the following commands to update:
sudo apt-get update && sudo apt-get dist-upgrade && reboot
- Your system should have have received the update.
Please see if the issue is resolved.
I also recommend you edit
/etc/apt/sources.list again and remove the line that you added after updating. This will return you to the normal update channel.