LG G Pad install stock rom

1. Go into download mode.
 Power off , push volume up/down and power button simultaniouly for a while
when it shows "dwonload mode" box on the screen,

2. go lg mobile downloda center
http://www.lgmobile.co.kr/lgmobile/front/download/retrieveDownloadMain.dev

3. follow as below

























4. Then LG Mobile Support Tool pop-up

5. Install USB driver then connect G-Pad

6. Then select 부가기능 > 업그레이드 오류복구

In my case it takes about 11 minutes...