Just reboot it and it should work. Flash again if it doesn't work.
Btw, where did you download 0.3? You'd better try to install 0.2.2 (
http://openinkpot.org/pub/releases/0.2.2/) or even the daily snapshot (
http://openinkpot.org/pub/daily/)
If your Bebook has got 512Mb flash, you should use v3ext firmware.