D851 boot loop on T-Mobile screen - T-Mobile LG G3

Bought a used D851. It is stuck in bootloop at the t-mobile screen. When i turn it on, shows LG logo, then green android icon for few seconds, then again LG logo. After about 1 minute, the white t-mobile screen shows up and stays for about 45 seconds and then screen goes black followed by white t-mobile screen again.
I have tried stock recovery with lg mobile tools. Also tried lg flash tools and everything goes fine, at the end, i get blue reset status 3 screen. Upon reboot, its back to boot loop. Also tried factory reset. With lg flash tools, when i choose "Board" then after reboot, it logs on to the minios menu but the screen is completely unresponsive. So when i again flash with "upgrade" selected, it flashes fine but continues the boot loop.
Please help.

Try this http://forum.xda-developers.com/showthread.php?t=2880311

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