Can you take pic of option button I am not sure what you meanI will do the same promptly this evening when I'll come back home.
I saw this post from Drone Master and it works :
With Go 4 all you have to do is have everything turned on and tap and hold the option button in the upper right screen for 3 seconds and it will bring up the downgrade screen. Select the last version to downgrade.
is this an easter egg from the DjiGo4 ? never seen this info elsewhere, it is brillant !