[sixburgh]

Can someone please help me?

I want to reset my asus chromebox cn60 back to chromeos.

I am getting this message when the machine boots

gbb.flags is nonzero: 0x00000039
read-only firmware id: Google_Panther.4920.24.21
active firmware id: Google_Panther.4920.24.21

chrome os is missing or damaged.
Please insert a recovery USB stick or SD card.

I created a recovery disk through the Chromebook Recovery Utility, using a 8GB USB stick
Rebooted with the stick in it, it still keeps showing the above message.

How do I fix this?
All I have is a USB stick.
If you say that I have to reset any flags, how do I do that?
I can't even boot another OS, can I?

Worried if I have bricked my chromebox