hi i have installed 5.0.1 few months ago on moto g 1st gen after rooting. i had unlocked the bootloader. i have been facing problems since then like "emergency calls only" after every 15 mins.i want to revert back to stock android.i am able to perform till rebooting the phone into bootloader and i m not able to perform any steps further. please help me .thanking u in advance.