2.1 isn't a factory applied update and you can't get it over the internet. Regardless of the build date, it won't be on the set. If you want to apply it you have to do it manually via SD card.http://panasonic.jp/support/global/c.../down_pro.html
If you plan to use D-nice settings and
want it to look as close as possible to the
way he calibrated, don't apply 2.1.
If not, and you'll either self-calibrate or get
a pro cal later, then apply 2.1 before doing either.
Simply using THX mode and self-calibrating works very well after 2.1. This is just too simple for many though.