thanks all for the help
i already fix the problem and back to the old software VZW_XT926_4.4.2-KDA20.62-10.1
this is how i fix it
i use a file i download it from here ( xt926-FlashBack-to-JB_updater-ver5)
then i use DROID_RAZR_HD_Utility_1.21 to install an old software
after that i use RSD - universal flashing option
after the phone boot up i use factory reset
after phone reboot im on VZW_XT926_4.4.2-KDA20.62-10.1 some how factory reset erase 4.1.2 software and keep 4.4.2 the storage space back from 4.5GB to 3.8GB
then i got another problem Sticky Bit Fastboot
and here is the fix
First you want to download this zip file extract the file to your computer so it should read C:\Android
Next click on it once so it's selected hold left shift and right click and click on "open command window here"
Now plug in you phone and boot it up normally, then make sure usb debugging is enabled.
now in the command window type "adb devices" (this makes sure your device is hooked up and ready to be fixed)
List of commands to type in. ( in order)
1. adb reboot bootloader
2.fastboot oem fb_mode_set
3.fastboot oem fb_mode_clear
3.fastboot erase userdata
4.fastboot erase cache
5.fastboot reboot
download all the files from here