If you are unable to fix it through the system recovery menu then it needs to be sent back to LG. I am still waiting for mine to come back to me I shipped it almost 2 weeks ago and I am supposed to be getting it back Wednesday.
I contacted LG and they said they'd send a box evaluate it and then either repair or send a replacement. I went to VZW and they overnighted me a replacement albeit it was a refurb no questions asked.
It's a common issue with all G4's call in to troubleshoot..they will either
fix over the phone or send you out a replacement
Mine only gets to the LG logo, stays for about a minute, then shuts off. there is no way to get to any smart mode. Taking the battery out and re-installing it only allows me to use the power button to again get to the logo, then off. the power button only works once after the battery is out.
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