Did you get this figured out?

 

Please learn to use the search function.

http://androidforums.com/ally-all-things-root/162822-lg-ally-rom-root-guide-faq.html

 

Lol. Use gingerbreak.apk

Google it.

 

The guide is your best bet, just no vista!

I would use the guise in the first quote, give you fastboot (search the ally - all things root for more info) which will make it pretty difficult to brick your phone, gingerbreak will root it but its still possible to get in a bootloop and have your recovery get messed up.