Rooting Motorola Photon 4G (Sprint locked)

Motorola Photon 4G: How to Root Your Phone
(all the credit goes to xda developers and  Eric Finkenbiner)

The Android development community has been hard at work creating various ways for users to gain root access on their Motorola Photon 4G. If you need a pain free way to root your Photon 4G, follow these steps and you’ll have root access in no time.

First turn on USB Debugging.

1. Go to Settings >> Applications >> Development and  tick "Usb Debugging".
2. Now download the files needed to root the phone. XDA-Developer user edgan created a tar file with all the necessary files. Download photon-torpedo.tar to your computer then copy it to the sdcard on your phone — in this example, I used the download folder on my sdcard. (/sdcard/download/...)  USB connection must be in "USB Mass Storage" 
3. Once the file is copied, go to USB Connection in your notifications area and change it to "Charge Only". 
4. Unplug the USB cable.. 
5. On the Photon 4G, go to Market (Google Play) and install Android Terminal Emulator , and also install "Superuser" 
6. Open the Android Terminal Emulator and copy the photon-torpedo.tar to /data/tmp. 
• $ cp /sdcard/photon-topedo.tar /data/tmp 
• $ cd /data/tmp 
• $ chmod 777 photon-torpedo.tar 
• $ /bin/tar xf photon-torpedo.tar 
• $ ./photon-torpedo.sh  (it will produce some error, but just ignore that..) (you'll notice "root@localhost" listed at last line of the terminal..)
• root@localhost# ./install-su.sh 
• exit 
• exit 
7. Restart the Photon 
8. Verify the Root Installation by two method 
9. Go to terminal and type 
• $ su               or... 
• Install "root checker" from Market..

Enjoy your rooted Motorola Photon 4G.