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Installing OpenWRT on a Mikrotik Hap AC2

Installing OpenWRT on a Mikrotik Hap AC2#

Router: MikroTik RouterBOARD hAP ac² (RBD52G-5HacD2HnD-TC)

You can follow the basic guide on openwrt for mikrotiks

remember to store your RouterOS license

If the default gateway of the device is it may be preconfigured. In which case you should reset it as described in this video

The simplified version is:

  1. Download the Snapshot and snapshot upgrade. It is important to note that the referenced version on the hap_ac2 page does not include the LuCi browser interface. So it is better to use the files from the firmware selector
  2. Boot into a linux OS or Live CD and make sure dnsmasq is installed

    dnsmasq is best installed from source. To use ifconfig you need sudo apt install net-tools. You also need to have make and gcc to compile.

  3. Create this script (change the user. If your router defaults to then this will work - if not make sure to change the network address. Also change the dhcp-boot to reflect your chosen firmware.):

    /sbin/ip addr replace dev $IFNAME
    /sbin/ip link set dev $IFNAME up
    /usr/sbin/dnsmasq --user=$USER \
    --no-daemon \
    --listen-address \
    --bind-interfaces \
    -p0 \
    --dhcp-authoritative \
    --dhcp-range=, \
    --bootp-dynamic \
    --dhcp-boot=openwrt-21.02.1-ipq40xx-mikrotik-mikrotik_hap-ac2-initramfs-kernel.bin \
    --log-dhcp \
    --enable-tftp \

    The above script is available at openwrt mikrotik netboot Make sure the file is in the same directory as both the init and upgrade file, ensure it is executable and run it:

    chmod +x
    sudo bash
  4. Then make sure your Mikrotik router is in DHCP boot mode

    • Connect the router, plug in ethernet into LAN port 2. Go to, login.
    • System → Routerboard → Settings → Boot device: Try ethernet once then NAND
    • System → Routerboard → Settings → Boot protocol: DHCP
    • System → Routerboard → Settings → Force Backup Booter: Checked (if supported by your routerboard - !IMPORTANT)
    • System → Shutdown. Power down the router.

    Hit Apply

    If the above doesn’t work use method 1: reset

  5. Put the ethernet cable into WAN port 1

  6. Start up the router
  7. The loader script will show a connection (you might need to re-run it). It will say sending file, then sent. Once complete it will output some data…then sent size and at the end it will say server-identifier or something like that. It takes about 10 minutes.
  8. The router should be running openwrt now - note you must connect with ethernet wifi will not work.
  9. Test you can ping to it: ping
  10. You cannot telnet but should be able to ssh: ssh root@
  11. Also check if you can get to the Luci browser:
  12. Flash OpenWRT to permanently write openWRT to the device:

    • Go to System → Backup/Flash Firmware
    • Click on ‘Choose File’ under ‘Flash new firmware image’. Select the sysupgrade .bin file you previously downloaded for your RouterBoard
    • Click on ‘Flash image’. This will flash the sysupgrade .bin file into your RouterBoard and reboot it

You have successfully installed OpenWRT on the Mikrotik hap AC2. Now look at the openwrt user guide

Restoring RouterOS onto a Mikrotik OpenWRT#

I did this on ubuntu

Follow these instructions

The important points to note:

  • if you have installed openwrt on the device you will need the keyfile to reinstall:

    ./netinstall -r -k .key -a routeros-7.1.1-arm.npk

  • You must download the image and netinstall binary marked as stable

  1. Set the static IP:

    1. Ubuntu -> wired connection -> settings
    2. Settings -> IPv4 Address: Netmask: Gateway: DNS: (Automatic off)
    3. Apply
    4. Turn the toggle on and off
  2. Run the script

    sudo ./netinstall -r -k .key -a routeros-7.1.1-arm.npk

  3. Enable the Etherboot

    1. Put LAN Cable in ETH1 (Internet/PPPoe)
    2. take out the power cable
    3. Press reset in and hold
    4. put power cable back in
    5. Wait for the light to start flashing and then stop (about 20 seconds)
    6. Release the reset
    7. Script should start
  4. When it is completed it should sat Sent reboot command

    Will reset config Using server IP: Starting PXE server Waiting for RouterBOARD… PXE client: B8:69:F4:83:F9:98 Sending image: arm Discovered RouterBOARD… Formatting… Sending package routeros-7.1.1-arm.npk … Ready for reboot… Sent reboot command