ATT LG optimus G E970: Stuck at logo! Please help!!!

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http://forum.xda-developers.com – Hi everyone, I buya LG optimus G on the craiglist. Then I try to unlock boot loader to install custom rom. But after I usedTeegee to unlock, the phone gets stuck at LG logo. I try to access download mode to reload stock rom for it, but I could not find the kdz file for it. I found on some forum that I need a correct Serial number to download kdz. However, because the phone does not boot, so I can not know the serial number to download. Try to use LGNPST to load Nexus 4 firmware to hope it boot up to get serial number, but this program always so error because it missing LGNPS_LE970.dll file. (HowTos)