From the edl / qdload 9008 state, you can't afaik.
Here's how I think you can :
1 - Unplug your device from USB and power it off from whatever state it is.
2 - Power it on pressing Power + Previous button (keep holding, you should be ...
I've attempted to deal with the devil by trying to root my Pioneer XDP-300R resulting in a bootloop problem (device is stuck on "Powered by Android" screen).
I attempted to flash a boot.img for a Onkyo DX-P1 (which is the same firmware), an...