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 RAZR M xt907 owner, from any version to 4.4.2 (KDA20.62-10.1).
Things you will need:
FXZ
Instructions:
Use the with KEEP DATA to flash this to your phone with RSD.
OR
Use the with KEEP DATA to flash this to your phone with fastboot.
This will get you a clean OTA install with no data loss. You will lose root.
SUPPORT:
Q: My RAZR HD or M is stuck in AP Fastboot mode with a sticky bit failure. Help?
A: Follow that.
See here for locked device root/unlock info: