Is it okay to have old fw battery in not as old fw aircraft?
2 drones differ in fw, so gotta hold batts at lower regardless 1 aircraft has higher fw.  

It happens by rma writing undesired fw on ac returned to which hot flashable asst2 no longer back peddles like before (no wonder gates folks banned dji usb cabling drvrs from win10) to cherished older fw that doesn't hog processor resources like newer fw does

I am stuck undoing the rma fw to a lower fw allowed by asst2 previously until hot flashed preemptively by dji win10 asst2 drvrs outlawed by gates

What to do? Send back aircraft to backpeddle fw to match the older unupdated and desired fw drone?

Hi. Thank you for reaching out to DJI Forum. With regards to this matter. It recommend to make sure the firmware of both the drone, remote controller and batteries are up to date. To ensure the stability of the drone during flight. Thank you.