Simple example:
You use assistant software1.0, then you could upgrade to firmware 3.00


But if you want to upgrade to firmware 4.00, you have to use software 2.0


So,If you would like to upgrade the latest firmware,Please download the latest assistant first.

This rule is suitable for all the products in DJI now

No offense Julain but your post is a little confusing
What should be noted is...

If you are trying/wanting to upgrade the firmware it is incremental
and dependant on the latest assistant software release,
You "can not skip" the new assistant software release if you want the new firmware.

DJI-Darryl Posted at 2014-12-11 15:29
No offense Julain but your post is a little confusing
What should be noted is...

I believe you give us the best best post~
Thanks