Blackberry 8120 for TMO; getting protocol error

hello, im new to the BB pearl 8120 and ive been lookin for radio to play and i did (which is why im here) everytime i go to stream a saved radio station i get a protocol error (the protcol specified is not supported by the handheld) and ive seen i need OS 4.5 but i went to TMO website for the new OS and i have the the most recent which is v4.3.0.115. any thoughts or helpful ideas?

You have to have OS 4.5 - it is available on the Blackberry website

ok i did and i cant really seem to find it. i have tmobile and i know its different with ur service carriers