Originally Posted by Redflea

It's a nandroid, so I think you should be able to just do a restore of it over 2.1 and it will replace your boot, data, and system directories...but I've never installed 2.1 (just 2.01+2.1 apps ROMs) so maybe there is some issue here I'm not aware of? Hopefully someone else w/experience w/2.01 over 2.1 will reply. You could probably as the question in the thread at alldroid as well...

In either case, do a nandroid backup of your current setup before making any changes, so you can revert if you want to.