First he wanted to go to Dev 22454, then when he was almost there he changed his mind.
He just doesn't know what he really wants.
With a red zone box (legacy BIOS), I've gone from a 19043.1202 public build, (Non insider) to 22000.184 and then from 22000.184 to 22454.1000 R.P. and then changed to Dev.
There are tricks to work around the obstacles (for now) and do all this, but what's the point if the machine is not supported ?
Right , FG ! The Point is " my machine won't support Dev updates "
I believe the jury is still out about that, and most likely there will be witty users coming up with tricks to bypass MS blocks just as they did this time around.