Originally Posted by Groid
Once the US TMobile is available for 4.4.2 you should be able to fastboot (or mfastboot for the system.img) flash the update without losing your recovery. I'm sure someone will post specific steps to update unlocked bootloader, custom recovery phones once the 4.4.2 image is released. I have seen posts warning about not flashing the boot image because it can't be reverted, but I don't know if that affects phones with an unlocked bootloader.
affect the unlocked bootloader people, that is why some people are waiting for the sbf. If you update via the OTA, it will install the new bootloader, regardless of lock status. Once on this new 4.4.2 bootloader, it is impossible to flash any stock images before 4.4.2 (you cannot go back to 4.4 or 4.4.2).
But why would you want to go back if you have an unlocked bootloader already? I don't really see any reason to flash an image that is earlier than the latest... if I were Moto, I would let people flash the earliest system image of that version of android (4.4 kitkat in our case). This would rectify the root situation (because 4.2.2 isn't kitkat), and it would keep the people happy as well.
LG PM-225 > LG Muziq > Epic 4G > Nexus S 4G > HTC EVO 4G LTE > Galaxy S3 > Nexus 4 > Galaxy S4 > Nexus 5 > Moto X