If i'm not mistaken, the firmwares need to be downloaded.
You'll find them in /data/data/com.parrot.freeflight6/files/firmwares/ but only after downloading. If you don't want to update straight away, just connect the controller, let it see that you're running on an older version, and disconnect. Then, you can pre-download the firmware without updating it. Same goes for the drone.
If you connect to the drone's wifi with your phone, you can use default gateways address to open up a control panel of sorts, and there is an option to upload an update file, however I tried it before, and you're not able to downgrade, or manually update the firmware with that.