My AVATA has a remote controller 2 with the firmware upgrade, they are linked, both AVATA and remote contoller 2 had good battery level indications and the AVATA flew very nicely for 10 or so minutes. Landed to swap in a new fully charged flight battery.   I turned the expired flight battery off before swapping out.    The AVATA and remote controller 2 are still linked, the gimbal can be moved using the controller but using CSC on the remote controller 2 the motors will NOT START??

Hello there wallacebj. Thank you for reaching out and for giving out these information. I will post some information below on how to start the motors of your DJI Avata using the DJI FPV remote controller. Thank you.

Thanks for your reply.
The Avata aircraft boots up OK with normal status indicators (red, yellow, green).
Then binks yellow (which is OK as it is indoors).
THEN binks red which is Warning indicator  ... a IMU error?
What should I do?

Easy fix ... IMU calibration from googles 2.