You can add a dual boot, so you can boot from an external sd card. I succesfull done it with my Glo, I don't know if it's possible with Touch.
Or you can simply install Android on the internal sd card and, if you want to turn back, restore the previous image. The installation process do a backup of the original card.
Last edited by Lucas Malor; 11-24-2014 at 03:58 PM.
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