Dandemon wrote I did this, and they sent me build 170526, which appears to date back to 27 May 2017. I'm a bit reluctant to install it though. What does it fix or improve (if anything)? Can you roll...

i don't think this support firmware recovery through tftp

not following you, what is your topology? maybe a picture can help better understand this.

this maybe a router hardware issue

try another web browser and reset it

no idea, but you can google a software which can monitor each device.