Hi folks !
Found the solution for my RAW problem with Nikon Z6 II.
It's not ZWO Firmware, it's me.
For shooting I use U3 mode with specific settings.
When Asiair do preview it works but when Asiair do a plate solving it tells me there's a RAW problem.
If I tried to do a new preview after the plate solving, I had the same message about RAW problem. Strange...
So I've downgrade Asiair version to 2.1 and 2.0 with an Android terminal. Same problem.
But in fact the problem was that for plate solving, Asiair switch Nikon Z6 II to M mode automatically.
And in the M mode, I was in JPEG, not RAW.
Its a little bit strange, but's it the explanation.