[Q] Factory reset possible after root? Help plz

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http://forum.xda-developers.com – Hello, I have rooted my cell and installed jaggy rom. Now i want to give my cell phone to my brother but when i try to remove my gmail account it says u have to factory reset. Now my problem is if i try factory reset it will end up in white screen.. Can u tell me how can i reset my phone so that my bro can link his gmail. Or tell me the way to remove my gmail account without reseting. Please help. (HowTos)