Help with building and installing android

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http://androidforums.com – Hello, New member and long time user of android here. I am a web developer by profession and have always enjoyed the control i could exert on my laptop/pc , since I have always been able to install what ever OS I liked, Linux, Windows, Solaris, hell even dos 6.0 lol. Recently I started looking into doing the same (maybe install a fresh version of android 2.1 on it) to my old android phone (HTC Hero) and after a lot of searching on the net, I'm starting to contemplate that it might not be as simple as I thought since smartphones are not as open to fiddle with in comparison to PCs (General)