flash CM10 tab not rooted

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http://forum.xda-developers.com – I have tab 2 10.1 been trying to rooted using Weltwon method without any luck, I read somewhere that I can flash CM10 that had root build in.... can I do that? read instruction to flash CM10 it say I need tab to be rooted... please confirm that I can flash CM10 while tab not rooted... thanks (HowTos)