Updating razr firmware
You will need to connect your Android phone with the computer.
For that, please make sure you have installed the USB drivers for Motorola Droid RAZR properly. The tutorial is on the next page, but first, please take a look at the following tips and important points you need to take care of.
Also, for being able to install the Android 5.1 Lollipop CM12.1 OS, first you have to root your Motorola Droid Razr.
You can now update Motorola Droid RAZR XT912 to Android 4.3 CM10.2 M1 Jelly Bean using our easy tutorial below.
As you continue reading this tutorial, we will tell you how to install Android 4.3 CM10.2 M1 Jelly Bean on Motorola Droid RAZR XT912 with complete steps and instructions.
We don’t have you on gun point to try out this tutorial 😉 NOTE: Since this is not a final build, make sure you know that after installing this firmware update, your Android device can get FC errors, boot loops, several other bugs, apps might not work or worse, your phone might not boot.
To fix, you will have to reinstall stock firmware or any other stable custom ROM. This is a custom ROM, based on AOSP release of the Android 4.3 Jelly Bean.