[Q] Bought a HD2 ~for fun :) please enter and talk with me!

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http://forum.xda-developers.com – :cyclops::cyclops: XDA is really helpful. I have been using galaxy nexus>galaxy note and root/flash following the XDA. Recently my friend bought a HD2 for fun and he recommend me to buy one so I buy a new T-mobile HD2. It's still shipping but I wish I could start reading the root/flash processes. My phone is in stock WM and radio, I would like to keep the radio band 1700/2100 for 3G. I have a few question about root/flash: These question may be existed in the past but I am too lazy to look for them one by one, so I hope you guys can help me with your kindness:D 1)What is the mode (HowTos)