WARNING: You REALLY need to UNDERSTAND and read EVERYTHING or you MAY brick your phone!
Purpose of this thread:
To get you, the locked or unlocked Droid Mini owner, from any version to 4.4.4 (SU4.21).
Things you will need:
Use the RSD Flasher with KEEP DATA to flash this on your phone with RSD.
This will get you a clean OTA install with no data loss. You will lose root.