Originally Posted by crachel
Flashing boot images doesn't delete all storage data. The -w flag in the flash-all.sh script does. Open the flash-all.sh script with a txt editor, remove the -w and you will have 4.4.2 with all your data intact. Asking for a random nandroid off XDA happens to be both a waste of time and an unnecessary security risk
This will work fine then?
fastboot flash bootloader bootloader-hammerhead-hhz11k.img
fastboot flash radio radio-hammerhead-m8974a-188.8.131.52.23.img
fastboot update image-hammerhead-kot49h.zip