I installed the one read "lgp920-v21a-NOV ***" I think its safe because theres a restore option
after a reboot I tried to call my dad's phone, and use the speaker(this is where worst echo should happen)
and I yelled many time using my dad's phone, I couldn't hear a thing!
and the Thrill side can hear my voice (call quality has no problem.)
SO excited to share with everyone
Echo problem was the only thing that holding me back to the CM rom
Now It's solved!!
can any of ya test it out and confirm this works for everyone?