I have noticed in the DJI GO 4 app under the Me tab and Clear Cache, that I have almost a gigabyte in the firmware cache.
Does anyone know what this is used for and is it safe to clear out?

No worries, it is alright to clear the firmware cache, coz when doing an upgrade, the app will download the cache first. It only clears the downloaded firmware, if you had finished the update already, clear it.

DJI Thor Posted at 2017-10-8 18:32
No worries, it is alright to clear the firmware cache, coz when doing an upgrade, the app will download the cache first. It only clears the downloaded firmware, if you had finished the update already, clear it.

Thanks very much Thor.

Jenee 2 Posted at 2017-10-8 20:31
Thanks very much Thor.

You are welcome. Should you have any further questions, please feel free to contact us. We'd glad to help.

So clearing Firmware Package in cache is ok. Didn't seem to Affect it.