AlanH0, 0xDF and DDL has worked on it, please enjoy.
Even it is late but, at least, it could be good for us to share about it.
The challenge archive has been attached as well ;-)
Aha, here are the scores and ranking of VXRL/valkyrie-x in DEFCON 18 and DEFCON 19:
It is not good enough but we will keep working hard and learning. Special thank you to the brothers from PLUS and give us lots of training and mentoring.