I had the same exact problem happen to me. I had tried numerous Android builds to attempt flashing, but only this one:
http://www.cheap-hack.com/home/en/computer-science/wm8505/guida-wm8505.html
seemed to work for me without the problem you described. I too was afraid I bricked the device. I had tried the 'UNGoogle_0.3.7_wm8505_V2_mod.zip' one listed, and that worked for me. You may have to turn it completely off and then try reflashing. I assume you're familiar about the script directory, and the like?
I know you wanted to get back to CE, but this is what I've personally done with my Sylvania 7" netbook. I've flashed to Android, but not from Android back to CE. Perhaps someone else can chime in on that aspect.