http://androidforums.com/threads/unbrick-unroot-lg-optimus-f7-boost-mobile.747821/
go there to unbrick your phone. Also, not all korean roms will work for our phone. Only roms from our equivalent phone the f260s will work, although data and 4g will not be guaranteed to work and will need playing around with to get to work, camera might not work, LEDs will have issues, and screen may be a little too dim. Also some roms from the LG VU2 might work for our phone, I really dont know and really havent tried and do advise against trying.