Using Touch Pro 2 in Brazil? Stock radio?

[kernel610]

My friend is going to be studying abroad for a few months in Brazil and I was going to loan him my old Sprint Touch Pro 2 for his trip. From all the threads and stickies that I read, it doesn't sound like it will be a problem to use the phone once he buys a SIM to use in the phone, right? My main question is about the radio. When I was using the phone, I had it unlocked and flashed an upgraded radio that worked better in my area (Telus I believe). In order to get the SIM working for him, do I need to flash back to the original Sprint ROM and radio or am I fine with a different radio? Thanks for the help!