Will I be able to migrate the config from a 2862ac acting as a mesh root to the V2927ac ?

(I'm doing this because I suspect the latter is needed to fully support Virgin Gig1 fibre speeds)

The full 'Configuration Import' function seems to only support the "2926 running 3.9.1.4 firmware or later", according to the Web Demo at: http://eu.draytek.com:12927/
(System Maintenance >> Configuration Backup").

These days, the various functions within a Draytek Router each have their own separate export to CSV feature, so you may be able to cobble something together, without having to type it all in again)

Thanks