Hello everyone
my router not startup from 2018 until now
when i power on my router just turns on Red LED
just I updated my router
how can I solve this problem?
I use net install, it said no Ethernet connected.

It looks like your ethernet cable isn't plugged into the first ethernet port. This is required for netinstall. Read this very comprehensive guide -
https://wiki.mikrotik.com/wiki/Manual:Netinstall

An Ethernet connection is still necessary. After all, the signal is more stable. If conditions permit, you can change to a router that can be connected by Ethernet.