Good day,

I have a problem with bridge port and nothing is working. Until i turning off the ether3 port, nothing is working.
Router OS verison is 6.43.8
Factory firmware: 3.22
Current firmware: 6.43.8

See the screenshot.

Try giving your bridge an admin MAC that isn't that of your ether interaces. I normally increment the first section of ether1 e.g. E4:XX:XX becomes E6:XX:XX