I would just like to point out for anyone reading this in the future that we are now 16 replies into this thread and I have seen no evidence that backs up OP’s claims.
As far as I can see the latest firmware available for a Mavic Pro is still v01.04.0500 from 2018/09/03.
Maybe you're talking of a separate flysafe update? That's not firmware so be clear if that's what you mean.