Easiest way for me was first unlocking the boot loader and then running the flash-all batch file which does everything for you. Didn't really need to do much and it works all the time for me.
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Factory images, 5.1.0 Build LMY47O, for both the WiFi and LTE versions are up on Google's developers website. https://developers.google.com/android/nexus/images
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Don't need any help, but I just wanna give a heads up that OnePlus One's OxygenOS is live. Head to the link oneplus.net/oxygenos.
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