@alzhao

Just hold the reset button for 10 seconds and wait the router reset.

No I do not have web UI, only Luci.

You know the web UI has to be there because this is a basic step we need to verify a new firmware.

What does this mean? Luci UI is there but no GL UI.

we can do a remote session via teamviewer.

Thank you but never would I do this.

I think best next step is to ask again for you to please tell me what files I should find on the directory tree, probably under /www? I will find them manually.