A problem with RetroStone? Not booting? Have you read the tutorial and flash the operating system correctly ? www.8bcraft.com/Retrostone-tutorial/
Also you can visit the forums to have a look if that solve your issue : http://forum.8bcraft.com
If that does not solve you problem contact us at firstname.lastname@example.org, please describe your problems with details (what is the problem, what you tried ...) and please write your order number in the message. Thanks!