Hello.
USB priority boot does not work after upgrade to qemu 9.
This option works fine with qemu version 8.
args: -drive 'if=none,id=synoboot,format=raw,file=/var/lib/vz/template/iso/arpl.img' -device 'qemu-xhci,addr=0x18' -device 'usb-storage,drive=synoboot,bootindex=1'