Help Identify and fix this Thang!

I bought this device: 10.2" ePad Android 2.1 WiFi Tablet Rockchip (ZT180)10" - eBay (item 390258623978 end time Nov-06-10 16:02:50 PDT)

I connected up my Google account with it, downloaded apps etc and it works great. However I am buying these for resale and I have a customer that wants this exact unit. I said sure we can do that! I tried to remove my google account and it tells me that I need to reset to factory defaults in order to do that. So I tell it to do that and...blank black screen on reboot, I have let it sit for 20 minutes...and then nothing! So I do a hard reboot and it comes back to life just fine, but my account is still in there and blah blah. I can not remove it! So I want to know what is my best option? This thing is rooted...I think (as I am a newbie)

Android sys info says:

2.1 update1
Host: Zenithink
model: P7901a
user: root

Processor: ARMv6-compatible processor rev 5 (v6l)

Any thoughts on how I can get my account removed or, can I just flash the ROM with the right ROM and use it that way? Please point me in the right direction, as I am sort of new at this.

Thanks!