I haven’t been able to change any settings on my AutoPi since purchase. No Changes are applies successfully. I have no HDMI output because the device is set to disable output, with no way to change this setting.
Apologies for the late reply.
In order to get the HDMI working, you need to plug it in before actually powering on the device. Could you try that and see if you get your display working?
Regarding your errors when applying the changes, could you try to be a bit more specific on how the changes fail to apply? Do they try to sync up with your device but then they aren’t changed or is there some error that shows up?