Not true. Use the radio that CAME with the rom. Tmobile releases a rom and radio together for a reason. So if your talking about the ginger leak, the .30 radio is the one that was released with that. Of course you don't HAVE to change it, but why wouldn't tmobile just not update the radio from froyo if there was no reason or nothing to be gained? The rom was built to work SPECIFICALLY with that radio. If we were talking about a custom rom, then ya I agree with everything said above. Since were talking about a stock rom, its a little different.
Radios are flashed through the bootloader. The chance of bricking or messing anything up when flashing through a bootloader is .0000000001% if not lower. So if you got an extra five min in your life go flash that .30
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