I suggest you check this guide out, I got a link from the guide I used and mine went perfect! He suggests this guide for NAND models, seeing as to how I followed his guide and everything went good, I trust in his word.
Here's the link
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P.S. Here's the link to the guide I used
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REMEMBER READ EVERYTHING AS MANY TIMES AS YOU NEED UNTIL YOU UNDERSTAND EVERYTHING, VERY IMPORTANT!!!