Diamond flashed to cricket changing ROMS and internet teathering

[mazimi777]

OKAY I AM A TOTAL NOOB, when i got my diamond it already had a cricket ROM on it so that mms internet, GPS etc worked. So the phone came already flashed to cricket with my number and rom was installed. My question is how do i replace this ROM with this new Mighty ROM will I lose any data? Please tell me step by step if possibe. I am worried if I download a new ROM I will mess up the things I have working on my phone already. Also the ROM that came on my phone renders me unable to use internet teathering this maybe because I am trying to use my phone as a modem on a laptop running vista and 32 bit windows mobile center. Do I need to have that on my phone to work properly please help I am lost.

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