Boot Manager

By TrevTech

The HTC sensation running 3 ROMS at once (MIUI, Cyanogen MOD and InsertCoin) with the help of Boot Manager. Allows you to install 5 different ROMs and to change which ROM you are running its just a matter of a reboot. Takes just a minute to switch ROMS very fast.

http://forum.xda-developers.com/showthread.php?t=1200403 this page has all the information you will need. before you can do what i showed you in the video you need to root your phone or install another rom thats already rooted (much easier) to do this go this website http://revolutionary.io/ it shows you how to s-off your phone aka security off. having security off allows you to install any ROM which most are already rooted. so have that done first and i will show you what next
Boot Manager is an app, designed for user's with root permission:
choosing the type of boot option
Note: you must have Root-Tool Manager in order for
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Program was removed from android market