Jamesnocut: Need flight modes in writing, not a Discord guess. INAV flight modes is the page I bookmarked. Set that before you leave the field with GPS.
Jamesnocut: This is the main source I use now. Configurator, firmware and the guides are all on inavflight.net. If you need 9.1, take the files there instead of an old dump.
Jamesnocut: No need to hunt firmware mirrors. INAV firmware is the page I use, then Configurator to put 9.1 on the board. That is enough for a first plane or quad.