You flashed a CDMA ROM to your GSM device then.
Hold down the volume down key while you press the reset with the stylus to enter the tricolor bootloader screen.
Plug into computer via USB, will say "USB" at bottom of bootloader screen. Now flash the stock or a cooked GSM ROM. Download a GSM ROM from XDA-Developers:
http://forum.xda-developers.com/forumdisplay.php?f=490
Edit: Nevermind this for now, if you actually flashed CDMA SPL on your GSM Pro2. You need to try and flash GSM SPL, should be at XDA-Devs. Same link as above.