A couple years ago I followed instructions here on making a bootable SD card with CM7 on it. It worked fine, but I decided that I liked the native software better for reading, and I haven't used it since then.

I recently bought an app for my wife's android tablet, and I'd like to get it on my nook, but it's only available through the play store, and my NC CM7 only has access to the market. I couldn't find instructions on how to update my card. I don't really want to root the device, because I still want to read with the native software. But I'd like to be able to have access to the Play store (the app is not on the market.)

Can I add the play store to my SD card? Can I upgrade my bootable SD to CM10?

Any Ideas?