[Q] Return to stock

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http://forum.xda-developers.com – Hi, I guess I'm gonna have to return to stock state in order to send the phone for warranty (dead pixel line all along the screen) I plan to flash a stock ROM with PC or Mobile Odin. My questions are : Will it be enough ? Will it reset the counter and install the stock recovery ? Shall I have to use triangle away before ? Thanks in advance. (HowTos)