Yes i tried to install older version of android .[4.4.4 to 4.4.2]
1.I am running STOCK 4.4.4 with rooted . i would like to unroot my phone using RSD Lite
2. I was Downloaded MOTOROLA Stock Firmware 4.4.2 and then try to install older version using rsd lite . Then it Shows Downgrade Security reason error. .
3. I lost my whole data also , then i was install CM11 using adb sideload commands then it works Ok
i was rooted my phone correctly . again i would like to go to stock that's it.. i am waited but it shows directly error .
I suggest you not do anything else until you've researched this a bit more.
No, you can't downgrade safely. You could brick your device trying, or later by taking an OTA.
I don't, and many others, ever suggest downgrading. It's very dangerous and has left many with serious problems, or even unusable devices.
That said. Why are you trying to unroot exactly?
Also... You can only flash the 4.4.4 files now. They probably aren't available yet so you will need to be patient. If CM is working for you now, that's great.... But you may be stuck like that until the SBF files are out for 4.4.4....then you can flash it with RSDLite or fastboot.
I don't see you have any other safe options.