"Have had the same issue. I reflashed the Firmware, calibrated the gimbal without any success. Then i exchanged the hardware step by step. The issue was solved after exchanging the controlboard"

"same issue with my new copter as i want to use the emax 12A escs with blheli on pixhawk. I also think that the escs are sitting in the bootloader mode because i cannot hear the arming sound of the escs. Hope that chris will find a solution.
vb…"

"Hello Mike,
please look for a opentx manual on the web
please find attached a german version
vb HartmutOpenTx Manual DE.pdf"

"Hello badboy2, everything on the pictures looks normal.
please start MissionPlanner on a PC, connect, now on the "flight data screen" it will be shown up why your iris will not arm.
Another option ist to upload your logfile here in the forum that we…"

"I have the same question.
At the moment i am flying my IRIS+ solo (without a gimbal or frontmounted gopro) with the parameterset IRIS+, and it works fine.
Are there any users of IRIS+ with experience in IRIS+ with gopro in a gimbal.  What parameters…"

"Hello Dax
a look in my log file shows me that firmware on my IRIS+ is "ArduCopter V3.2-Iris (b212c020)"
Should this be updated ?"

"Hello Michael
what do you meen with "If it is the original iris+ firmware that can happen" ?
Is there a new firmware, which is recommended by 3DR to flash on the IRIS+
Up to now i thought the firmeware of the IRIS (AC3.2-iris) is something special…"

"@Dax
ok, i see the lines with PARM
thank you, learned something new"

"@Erik
If you did not change your parameters since your crash, then you can have a look at them in MissionPlanner.
Connect your IRIS via USB to MissionPlanner and go to <Config/Tuning>, then select <Full Parameter Tree> search for FENCE and click on…"