i was trying to find a way to change the country inside solo since i imported from USA
i didn't try this yet but there's alot about host .conf's inside root/etc/
I tried that and it didn't keep the country code that I set on the controller while the Solo did keep the country code. Someone else found that it worked on the older firmware, but in 1.0.5 a hidden partition is used on the controller to check for country code. There's probably another way around this however you should contact 3DR and see if they have an easier solution to this for you.