I bought an IRIS+ in 2015 with a Tarus camera gimbal and flew it a few times-- including some auto Missions. Then I discovered 3DR had gone out of business and the copter has largely sat on the shelf for 7 years. I just bought 3 new batteries for the copter and one for the radio and the copter flew fine for 5-6 times--including 1-2Missions loaded on from Mission Planner.
--Then I began getting the blinking yellow light instead of the blue green light sequence indicating successful pre-arming checks and GPS lock. Also, every time I hooked the copter to Mission Planner (Ardupilot), I got a message about updating the firmware on the Pixhawk-- so I followed the instructions on the arducopter website and installed new firmware. The instructions said the parameters would remain unchanged, but after the upgrade, it has been nothing but trouble-- one arming message after another: "needs accelerometer calibaration", "Arming light problems" etc. Also, the safety button/arming light acts very bizarre, and other things. For example: LED on copter after plugging in battery turns blue (after red/blue flashing pre-arm checks), I get a solid blue light and a message about the arming button,-- I push the arming button and it goes from flashing red to solid, and the other led goes from blue to flashing green, then solid green (supposed to mean GPS FIX), but down/right on the radio does not start the props. Also, camera gimbal no longer responsive to radio controller.
--Sorry about the long rant-- but it's a mess.
I tried loading the stock prams back on the copter from the drop-down menu in Mission Planner, but that didn't help.
---Bottom line: I am grounded and don't know how to proceed: --how can I just get this copter back to the original configuration-- which worked?
--Obviously I'm no expert at this, but I can follow instructions.
Thanks in advance,