Download This! (Everything you need is there,.)
Enter in "fastboot" holding Power and VolDown on Moto G
Download "Restore Moto G"
Extract in the Desktop or where you want.
Install Motorola Drivers (Motorola Device Manager) on Pc
Install Minimal ADB and Fastboot on PC.
Hold Shift and right on extracted folder.
Chose "Open command line here".
Type "RETAIL_GB.bat". and Enter
After, chose "normal boot".
Congratulation, you getted your phone unbriked with 4.4.4 OS.
For me this is the only way to unbrick my phone. I hope this could help.