Ebite software didn't help find the IP, but managed to solve the problem anyway.

I bought these miners second hand and it turns out that the previous owner set a static IP for his miners. While the other two miners had reset buttons, this one didn't  I heard that a batch of E9+ was released without a reset button. Of course as would have it the previous owner was impossible to reach.

To find its IP I connected it directly to my computer and used Wireshark to spot its incoming IP. Then I set my router so it can detect its IP and plugged everything back onto the local network, then I was finally able to get onto its page to enable DHCP.

I wish people would reset IPs before selling, although lesson learned, make sure DHCP is enabled before purchasing a used miner.