Why no more downgading in the Assistant 2 version 1.0.9.possible? Are there problems with different firmware of the RC?

Can't answer this question, but are you aware that you can download v1.1.0 from the P4P downloads? It may be different - I haven't checked this though. That version supports the P4 also, and I don't know why  it's still not available under the P4 downloads.

There were too many major changes in the latest firmware in order to be able to safely downgrade. There will be downgrade options for any proceeding firmware, but not currently.

That reason is just stupid.
Every new firmware has changes - that's why it's new.
Installing firmware is just like installing any other software. And if I don't like a the new one, I delete it and install the previous version again.

Any idea when we will be able to roll our firmware back? I get a battery signal error once i updated to the newest firmware that i didn't get before.

Maybe dji rubbing out of flash space with all the nfz stuff. Latest firmware probably more regional modular. Would explain why more difficult to downgrade although I'm sure not impossible. Wish dji would communicate better about upgrades etc, full changelogs would be excellent.

Running.   Darn phone text thing!