Root Need help flashing my htc evo 4g to boost mobile

[dahookup29]

How do I flash my phone to boost mobile network? Do I need to downgrade my phone, if so how do I downgrade it? The htc evo 4g is a sprint phone
Android 2.3.5
Baseland version 2.15.00.12.19
Kernel Verison 2.6.35.10-g4d0005
Build number 5.07.651.1 CL 356670
Software number 5.07.651.1 71ORD
Browser version Webkit/533.1
PRI Version 2.33_003
PRL Version 60681

 

[ocnbrze]

Here you can use this guide:
http://androidforums.com/evo-4g-all-things-root/460035-evo-4g-boost-mobile-guide-evo-3d.html