1) downloaded factory image from
https://developers.google.com/androi...ges#hammerhead
2) extract the tgz, the tar within that, then extract the the zip within that to get the system.img and boot.img files
3) moved these two files into the adb folder (for the fastboot/adb method)
4) downloade SuperSU-v1.80.zip from
http://download.chainfire.eu/supersu
5) put SuperSU-v1.80.zip on your phone's internal storage
6) download the 4.4.1 OTA update zip from
http://android.clients.google.com/pa...M.7ed504f6.zip
7) rename it to ota.zip
8) move ota.zip onto your phone's internal storage
9) boot into bootloader
10) open command prompt from your adb folder
11) connect USB cable
12) type 'fastboot devices' to check the connection
13) type 'fastboot flash system system.img'
14) type 'fastboot flash boot boot.img'
15) use volume and power buttons to boot into recovery (TWRP)
16) install ota.zip
17) install SuperSU-v1.80.zip
18) clear dalvik and cache
19) reboot phone