Hello all,
After spending a whole day struggling with the subject, and having no luck with Google, I am compelled to ask for help.
I have followed the video referenced at https://openwrt.org/toh/mikrotik/lhg5_board_based_devices, but given that the RBLHG-5nD only has one LAN/PoE port, that video did not really help, as I didn't see my device fetch the initramfs file at all.
I am at the point where even after the usual reset, the device is not PINGable on 192.168.88.1.
The LEDs seem okay to me though, and I am certain it's not bricked as yet since no firmware has gone into it.
The device was on the latest Mikrotik firmware - 6.49.18, IIRC.
Does anyone know why it's no longer responding to ping?
For those who succeeded in flashing OpenWrt into it, how exactly did you do it?
Thank you in adavance.
How are you powering, some people found adding a dumb network switch in between helped.
I am using a PoE injector. So the ethernet cable runs directly from the injector into my laptop.
I have tried the option of adding a dumb switch in between. No dice.
The fact that Winbox does not find it should worry me, right?
Can you see it using netinstall
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It doesn't show up either.
okay, are using windows or linux Winbox?
Are you able to login to the WinBox using the mac address?
If so, try to reset the MikroTik.
The easiest way to install OpenWrt on MikroTik in my opinion is with Linux OS.
By following this method:
Although I once successfully installed OpenWrt on a MikroTik LHG2 using Tiny PXE, I never used it again so now I've forgotten.
Using Linux OS is easier.
No switches needed, you just need to set the boot protocol to bootp instead of dhcp. 
The thing is that I previously used to login to it, but not anymore. Even Winbox doesn't detect is as a neighbor.
Most HOWTOs out there talking about RouterBoards assume that they all have WAN and LAN ports. RBLHG-5nD only has the ethernet port for PoE.
I will try using Linux and see.
I managed to RESOLVE this. I used Winbox for Linux and was able to connect to the device.
I have managed to install OpenWrt on the board from instructions listed below:
- https://github.com/ParsIOT/Openwrt_installation
- https://openwrt.org/toh/mikrotik/common
- This is important for uploading the sysupgrade image: XHR Timeout error message
Maybe this will help someone another day.