Got yourself a Galaxy Tab 2 7″ P31xx and not satisfied with running just one build of Android on it? Want to dabble into custom ROMs like CyanogenMod 10, but don’t want to lose the stock ROM at the same time? XDA Member Macadamia Daze has found a way to dual-boot two Android builds on this tablet.
This dual boot method runs one Android build from the internal memory and the other from the SD card. Before you begin, you must have an 8GB or higher capacity SD card, though 16GB or more is recommended. Also note that the ROM you are running from the SD card has to be prepared to run that way. Fortunately, the developer has provided the latest CM10 nightly already prepped for the purpose, along with instructions on how to prep any ROM of your choice for booting from the SD card. For more details and the complete guide, head over to the forum thread and enjoy dual-booting two Android ROMs on your tablet!
Also, if you have yet to root their Galaxy Tab 2 7.0, we have already featured the rooting instructions for this device as well._________