"Thanks :)"

"Great idea! I'll try 3.1.1 tonight!... I see there are three of 3.1.1, which one should I try? 2.77, 2.78 or 2.78b
Is the 3.1.1. (2.78b a beta)?"

"In your Mission Planner, Initial Setup tab, then select install firmware, All the aircrafts will show on screen, look on the bottom right you can pick previous firmware."

"Please help, yesterday I updated from 3.01 to 3.1.2 on the apm 2.5 board and all day I tried to arm but no success. kept saying my #FailSafe throttle value# is at fault but Ive checked many times and recalibrated everyting a few times and still not…"

"Same here I updated firmware from 3.01 to 3.1.2 and my failsafe throttle value was blocking my arming. Reverted back to 3.01 and its arms fine. There must be a bug in 3.1.2 for some 2.5apm boards. "