No idea. I have a wifi only tab 7 plus. The only thing the root_original.zip does is it makes /system writable and place 'su' in /system/bin. It doesn't overwrite anything. Samsung didn't even bother locking it down. Try shutting your tablet down then powering it up by holding the vol up button. If you can get to recovery, it should work for you. If this destroys your tablet, please don't blame me. Like I said, I have a wifi only version.
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By the way, if you don't believe me. Extract the zip and go into the meta-inf folder and keep on going thru the subfolders until you see updater-script and view it with any text editor. All it does is copy su into your tablet.