There are two parts to going back to stock. System wipe and data wipe. You need to do both.
System wipe:
Power off. Power up. When the "n' appears, power down. Do this 7 more times. It will reflash. The key is to power down when the "n" appears.
Data wipe:
Hold down the power button and the "n" button. Don't do anything with the volume key. You'll be prompted to reset.
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