It will be nice to have a easy way to install and Work over Serial for Devices without a Monitor.
The Problem in 1.2.x is the HowTo on The Wiki for 1.1.7 don't Work for 1.2.x
-> https://wiki.vyos.net/wiki/Network_appliances#Installation_for_Version_1.1.7_not_for_1.2.x
I tried to found a way but run in many Problems.
Best Regards