Part of the terrific service Freefly is doing for ALTA owners has resulted in them sending back ALTAs with the SYNAPSE set back to its factory configuration. Unfortunately, when I got mine I couldn't get my ALTA to arm, and it was because the Futaba's channel 9 (the arm disable switch) wasn't set up anymore. Adam from Freefly support walked me through opening the bay between booms 4 & 5 to expose the configuration jumper, which has to be removed to change channel assignments in the app. Once we did that it was simple to re-assign that switch to channel 9 and everything works properly now. This is documented in the manual if you need step-by-step instructions. Please note that the new app and firmware do slightly change the behavior of this switch, so you'll want to take some time to familiarize yourself with the new way of doing things. Whew!