Yea. I did update from v1 to V2 last night and it was fine. Autoboot sysNAND was disabled. Enabled it and it works. Fine.in the end you would set up a9lh and update there where you'd have cfw.
https://github.com/Plailect/Guide/wiki/Move-RedNAND at the end
update what payload? if you mean "v1 to v2", https://github.com/Plailect/Guide/wiki/Updating-arm9loaderhax