Disclaimer: You could brick your phone and/or void your warranty. What you read here and then attempt to do is at your own risk. I am not responsible for what you do with your phone, PC, Mac, or whatever else you are messing around with. Proceed at your own risk.

1. Download and save the nbh file to your PC from http://rapidshare.com/files/269267171/SAPPIMG_Sapphire_TMUS_1.88.531.1_COC10_release_signed.nbh
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2. Power down your phone
3. Remove the back panel
4. Remove the SD card
5. Insert the SD card into your PC
6. Copy the nbh file to the root of your SD card, no folder
7. Rename the file to "sappimg.nbh" if it isn’t already, be sure that it isnt "sappimg.nbh.nbh"
8. Put the SD card into your phone
9. Enter "FASTBOOT Mode" on your phone by holding the Volume Down and Power buttons (you can also use the Back and Power buttons) 
   • The screen will turn white with three little green robots on the bottom
10. Click the trackball and wait for it to pick up the "sappimg.nbh" file
    • It may be necessary to press the down volume button, followed by the back button
11. Click the trackball again to begin, it should automatically update from there
12. Once complete, reboot the phone