fix Motorola hang on logo with RSD Lite
1-first of you wand to install all motorola adb and fast boot driver to assess the driver please install Motorola Device Manager
RSD Lite from here and install it
4-You wand to unlock boot-loader before firmware update
5-To unlock boot-loader go to Motorola official website
Put your phone in fast boot mode connect to pc open comment promote type get oem unlock code
you will get some code copy that code in to Motorola site then you will get unlock code .
then copy that code to command promote Then your phone will unlock boot loader