Manual ota update

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http://androidforums.com – hey there everyone i have a question, I'm trying to install an ota leak on my phone and i am curious as how to go about this, it says i can install it from the internal memory from the stock recovery menu, but when i go in to stock recovery it does not have that option, only has the option to install from external sd memory and of few other options none of which are install from internal memory, any help would be great the phone is a s3 and im trying to update it to 4.1 bell ota leak (General)