You will need QPST software and your MSL/SPC code. First dial *983*87274#on your dialer and choose "only Diag" Now go to your device manager and choose ports and take note of which com port your phone has installed to. Now open QPST Configuration. If your phone is listed skip to next step. If your phone isnt listed choose add new port and manually enter the com port number of your phone. Now choose Start Clients at the top and then select Service Programming. Once service progamming is open choose your phone and ok. Now click read from phone on the bottom left. Here you will need to enter your MSL/SPC code. Now select the Roam tab on the top. Where is says Browse click and find your prl file you want to install to the phone. Now choose Write to Phone and your phone will reboot and give a few errors as it does. When the phone boots back up go to settings/about phone/status and check your prl to make sure it updated. Last things dial *983*87274#on your dialer and choose "AT". If you dont your USB wont work like normal.