You can try CScotty's suggestion and see if it works, I have done that before and for me I still get the dropped EDGE every once in a while.
Maybe you will have better luck, you can google swap a radio and follow the instructions, this is the easiest way to change your radio file and keep the latest OS..it will wipe your unit, so you will have to backup.
Later
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Running the following unlocked phones
Iphone Jailbroken
AT&T HTC Touch Fuze
AT&T BB 8310
T-Mobile 8820
Verizon 9530
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