Can be fixed. Get a rom for your device where you have the .img files (like system.img, boot.img, ...)
Then issue the command
fastboot flash recovery recovery.img
press and hold power + volUp, device will reboot.
quickly press and hold volDown. fastboot will succeed. Then do the same for the rest of the pack
fastboot flash boot boot.img
fastboot flash system system.img
fastboot flash recovery recovery.img
fastboot flash userdata userdata.img
fastboot erase cache
And you are all set.
This at least works on the European model (601)
*Phew*