I noticed that after I updated my OSMO, the microphone was slashed out even if it was turned on.  The way that I fixed it was to turned it off and then back on.  That should fixed it if you were unable to get audio before! Hope this helped, I was so frustrated before I figured it out!

Hello!
Thanks for your suggestion!
Could you please tell us more detail about the audio problem you came across before? That would be more helpful for our people.
After the latest firmware upgrade, it may happen that some devices need to be re-booted or the DJI GO App needs to be re-installed to fix some issues.