Yes, I opened the case, but they pretend something else is wrong. Like LACP not giving more than 1G regardless 4 ports used for it. OK! So, I use ether1 as a regular port, not WAN port, and directly connect 3 computers to ether2, 3 and 4. And computer with proven working 2.5G port connected to ether1. All the same. Port ether1 is nor 2.5G port. It’s 1G port. They refuse to accept their hardware is not tested well and is actually an alfa version. I was downloading movie files from ether1 connected computer to three others at the same time, Combined speed is less than 45MB (360Mb/s), when 2.5G removed from ether1 advertisement - speed goes up to 113MB(904Mb/s). And my HD is M.2 Samsung 980 PRO SSD 2TB PCIe NVMe Gen 4.
So, I am done with this ***
So much easier to deal with American company, I am back to EdgeOS.
(PS they removed 5009 from Amazon…)