These updates are NOT cumulative. These are strictly from A to B. Flash in order, with a reboot in between. Still much faster than a flash to stock. 
 
Flash with Recovery mode. No backup is required.

  
These updates will not update the speedmod kernel. In the full ROM files, I update the speedmod kernel to the latest one. But I know that not everyone uses it, so as a matter of convenience I leave it out of these updates. I highly recommend you keep your kernel up to date, regardless of which it is.

6.3 to 6.4


6.2_6.3.zip