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Most of the CM10.1 releases we talk about are unofficial. That's to be expected, as most of these releases are alphas, pre-alphas, or preview builds that don't really run well, but show that work is being done. When it's official, it's usually more stable. Now, there are official CM10.1 builds out for the Nexus 7 and the Samsung Galaxy Tab 2 7.0.
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.
With the Galaxy Tab 2 10.1 obtaining root, it was only a matter of time before it's smaller sibling, the Galaxy Tab 2 7.0, was rooted as well. Unlike the original Galaxy Tab and Galaxy Tab 10.1, which were released almost a year apart from one another, this generation offers the two sizes (as well as a few others) concurrently. Given the similar hardware and software, making the leap from one to the next is much easier.