v300 firmware

i have been having bad reception problems with my t-mobile v300 and even got
external antennas for both home and office to be able to use the phone until
the contract ran out. i decided to get a razr and the reception is
dynamite. i talked to t-mobile and first they said the v300 had firmware
upgrades to solve the reception problem and when i called back, the lady had
no idea what i was talking about. i want to give the phone to my son but i
would like it to have the latest firmware/flex that is available for the
v300. can anyone tell me what are the latest versions or where i can find
them. of course when i called, the t-mobile database was down. sigh.
thanks