Mavic Pro doesn't recognize SD card and app says disconnected

[Rob W]

Mavic Pro doesn't recognize the micro SD card saying no SD card.
When I put the card into the drone and power it up the DCIM and MISC directories are created but the mavic shows offline. The mavic finishes it's startup routine and goes to atti mode then to GPS mode-ready to go, but without camera and saying disconnected in the upper right corner.

When I try to format the card it says no SD Card.
I tried a new card and got the same error. I am using a Samsung 64GB 100MB/s (U3) MicroSDXC EVO Select Memory Card. I have been using the same type of card for the last 4 months and this is the first error I have gotten.

I have always updated to the latest version of firmware.
I am using an iphone 7plus

Is there a way to re-flash the drone firmware?

 

[Rob W]

OK, used DJI assistant 2 to reload the firmware. The problem was in the controller side.
Reloaded controller and drone, reformatted sd card, all is well.

 

[travellingtania]

I was having the same issue, Mavic Air was not recognising the SD Card... formatting on disk utility not helpful, had to instal SDCardFormatter and it worked perfectly: SD Memory Card Formatter 5.0 for SD/SDHC/SDXC