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LG got my main board of B9 to reproduce the problem and working now. They are announcing me that this will be fixed at next FW release.

I received WebOS 5.20.15 yesterday and update from 5.20.06. but the problem has not solved.

Same(OLED B9) Plug off power cable or re-registration HDMI into quick fix slot solves the problem temporary. but after standby, HDMI quick access would not work again. Before December's 2.20.06 update, there were no problem. so I think this quick access issue is 2.20.06's bug. I am asking to LG support. but they said that they couldn't reproduce the problem their side. Another region's users already have new firmware 5.25.08. but my region's recent version is 2.20.06. I don't know this issue will be solved by 5.25.08 or not. Now I am continue to contact to LG support to reproduce this quick fix problem on their side