I'm trying to install OpenWrt on my MikroTik Hex S (RB760iGS). I followed the advice steps here - https://openwrt.org/toh/mikrotik/common - I will now list the steps I followed in order, then at the bottom I will state my issue. The Hex S installation procedure is to load the relevant OpenWRT development snapshot into RAM, then install to disk via sysupgrade.
Downloaded the initramfs and sysupgrade files, then verified the sha256sum
Made the initramfs available via TFTP (using dnsmasq)
Rebooted the router while holding the reset button until it beeps, with a connection to my TFTP server in the WAN port. This is successful, the TFTP server sends the initramfs bin to the router.
Moved my computers ethernet from the WAN port to the LAN port on the router. Connected via ssh to the router, logged in as root. The router is running OpenWrt in RAM at this point, so far so good.
Transferred sysupgrade to router's /tmp folder via scp
Performed sysupgrade with the bin file in /tmp, sysupgrade seems to be successful, the router then closes the ssh connection and reboots.
And that brings us to now. Now I cannot connect to the router via the LAN ports. I tried all of the LAN ports. The LEDs on the router light up to show that the LAN port is connected, but I cannot connect to the router from my computer. I can't ping the router, I don't get assigned a dhcp IP from the router. I tried connecting via linux on two machines and could not. I tried connecting via putty on Windows and could not. I can start the whole process from the beginning, and everything works fine every time until the reboot after sysupgrade.
As an extra note, I also tried connecting via WAN, but after the sysupgrade the router doesn't seem to even make a dhcp request to the WAN.
Any help you can give me will be greatly appreciated. As a warning, I don't have a huge amount of networking experience, and this is my first time using OpenWrt.
Thanks so much for your time.