dji pro 3 4k all good but no video Please Help.

My Phantom 3 pro. 4K all works good But I have no video to my iphone 6s
Please any help we be great. I have tryed to up date the firmware, I’m running version
1.9.60+ right now. when trying to up date the firmware the Gimbal starts off with the green light alternating to red then about 30 seconds starts flashing red and doesn’t
update. any Ideals what to try, Thanks