Many users have been searching for the stock ROM for the Galaxy Tab 2 10.1 as they want to return back to a fully working firmware or for warranty reasons (your warranty gets voided if you flash a custom ROM or root your Samsung Tab).
In case you are running a custom ROM, you must flash this stock firmware to make the UMS flash storage utility work on the Tab 10.1 (as that utility does not works on many custom firmwares).