Please follow the tutorial here: http://androidforums.com/lg-optimus-m/254250-lgnpst-lab-1-2-better-than-my-fix.html
Keep in mind this is only for downgrading the MetroPCS LG Optimus M. If you have a different phone do not attempt this.
Keep in mind this is only for downgrading the MetroPCS LG Optimus M. If you have a different phone do not attempt this.