I have tested latest arducopter stable firmaware for openpilot revo ,
drone is finely flight no problem except LAND flight mode,
when I set flight mode Land after then 3 seconds all motor stoped and drone crashed
what is the problem ?
Can you send when this shit happening , (log file)
You can’t understand what I’m talking about then plz check this page after upload some file
https://ardupilot.org/copter/docs/common-downloading-and-analyzing-data-logs-in-mission-planner.html
Happy flying 
thanks
you know my board is openpilot revo no sdcard for log
but mission planner finded log files via mavlink (size 1.8mb) is this
I’m so sorry for right now I’m tooo busy on my latest target , plz forgive me but I will try …
Now you can find on this way , may-be it’s helpful for your 
Happy flying
thank again
btw ı am testing Return home and Land flight mode no problem but whitout land auto land.
land by my control
in this time I am not sure return and land flight mode
return home ok but land ??
Now , same problem facing at before ?
return home and land mode tested but whitout Land procedure
so, I changed to Altitude hold flight mode before drone auto Land mode (in Return home and Land mode)
So I am not sure Return Home and Land mode
other problems,
I am setting rgb led pwm out (only one led) works finely but FC not accept any rc input
cancelling rgb led setting rc input works finely
Try rtl final high = 1 meter or something then you perfect catch your copter
Or
Like tack of your copter like 1 meter or little bit and pitch forward nearly 20meter and go into smart rtl it should be confirm land mode is bad or not
Happy flying