Finally, rooting Android 2.2 Froyo is as simple as ABC. Thanks to z4root. It is a one click solution to root and un-root Android 2.2 Froyo. And is developed by xda-developer, RyanZA. Based on RyanZA, it should be 100% safe as nothing on disk is changed besides the root binaries. And if something goes wrong, just simply reboot your device should fix up any and all issues. Well, I cannot try it on Android HTC HD2 because mine is already rooted by default. But you can. So far, these devices reported working…