Same thing happened to me, the root was easy with gingerbreak, had root so I could run rom manager and flashed that to the clockwork recovery and backed up. Installed honeystreak using the nvflash and didnt like the instability of it so I wanted to go back but didnt realize the way back was another nvflash the breaks the device and then you have to recover from the cwm back up. I returned it at that point.
I've learned some more about nvflash since then, it seems its the official way they install the os's to the tegra devices. But without the official install files needed for your device, it has to be rigged. Which is why the honeystreak is unstable and the flash back to stock is broken and has to be recovered from a back up.
Windows, ubuntu are such easy installs compared to android. Everythings on a disc(that you can setup on a usb stick), there arent 14 or how ever many separate files you have to download(for the nvflash). And it just starts the install, you dont need separate program to install. They really made the process needlessly complicated for installing android.
I just find it hard to believe, non developers have to RELY on the hacker community to perform fresh(or not so fresh) installs because google/the middlemen dont provide installation media. Oh wait they provide the source code... which if your not a developer is no help to the uninitiated that just want a clean install, install newer versions.
http://forum.xda-developers.com/showthread.php?p=16257823#post16257823
http://forum.xda-developers.com/showthread.php?t=1018809&highlight=nvflash