From the 650 Part 23 install manual --
"Alternatively, the databases can be updated in Configuration mode via the Updates page. The GTN, by default, will only update to effective databases. If loading databases that are not yet effective, or if the GTN GPS time is out-of-date, press and hold the dual-concentric knob during power-up to install all database updates from the data card."
Retired Firmware Guy and Airplane Builder
2020 RV-14 QB -- Under construction - Tailcone & Empennage Complete.
2018 RV-7 QB -- Built, Flying
2007 RV-7 QB -- Built, Drowned, Resurrected and flying
1998 RV-8 QB -- Started, Sold
1986 Mooney 205SE
1980 Mooney 231
Aided and abetted building a number of other RV's.