Hi,
Seems the update bricked my red 10 also.
I have been experimenting with the recovery tool and the reason for the "Could not change network interface error" is that when the LAN connection is deemed "Unplugged" the recovery application will not change the network settings. I proved this by plugging my laptop into a switch and when the LAN was connected the recovery tool operated correctly (apart from discovering the red box of course)
So it seems this firmware has bricked the red device so much its not bringing up its LAN interfaces thus not allowing the recovery tool to recover the red device.
Hope this assists.
Good luck (I just ordered a new red15)
Cheers, Mark