Get CDMA workshop. I cant tell you where to get it. Get your MSL/SPC code. Using your dialer dial *983*87274# Choose "only Diag" When your computer installs drivers make not of what com port it installed to. Open CDMA workshop. Choose port and select connect. Then choose read to make sure. Go to security tab and where it says SPC input your MSL code then press the SPC button. Then choose send. If it is correct it will tell you. Now go to "Other" tab and where it says PRL click write. Find your prl file and choose it. Exit CDMA workshop and reboot your phone. Once rebooted open dialer again and enter *983*87274# and this time choose "AT" If you dont usb will not work properly.