MikroTik RB750P-PBr2 (PowerBox)

→ Install OpenWrt

Download Winbox from Mikrotik webpage https://download2.mikrotik.com/routeros/winbox/3.11/winbox.exe

Boot up the RB750P r2, connect your DHCP client to any of the ports 2 to 5 but not the Internet labeled port (Port 1)

Open up Winbox, IP Address 192.168.88.1, If a password has been set put this in if not the Default is just Blank

Also, while we are in Winbox lets backup the license so returning to RouterOS is later possible. Go to:

  System → Routerboard → Settings → License → Export key

Go to:

  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

Connect the LAN port on Internet labled port and reboot the RB750P r2, Connect the computers LAN port on Internet

Please note that the aforementioned mechanism is not properly working on some boards. Don't worry, boot up the mikrotik board, connect your DHCP client to port 1. An address from 192.168.88.0/24 must be obtained. You can now telnet to the board, and configure it for TFTPboot.

Telnet user is admin, leave the password empty.

telnet 192.168.88.1
system routerboard settings set boot-device=try-ethernet-once-then-nand 
system routerboard settings set boot-protocol=dhcp 

Now reboot the board, it should boot from the labled “Internet” port now.

For Windows 10 x64 (7/XP/Vista should be ok)

Download http://tftpd32.jounin.net/tftpd32_download.html (i used tftpd64 portable edition), initramfs-kernel.bin and squashfs-sysupgrade.bin as shown in the table above and save them in the same tftpd32 folder IMPORTANT

Extract the tftpd32 folder and make sure the initramfs-kernel.bin is there and open up tftp32 config file and match theses settings I have (worked for me)

[DHCP]
   4C:5E:0C:XX:XX:XX=192.168.1.250  (Should be the same ETH1 MAC Address)
   BootFile=lede-ar71xx-mikrotik-rb-nor-flash-16M-initramfs-kernel.bin
   Lease_NumLeases=2
   IP_Pool=192.168.1.2
   PoolSize=4
   Mask=255.255.255.0
   Gateway=192.168.1.1
   Lease (minutes)=90

Save!

Open up tftpd64.exe and the go to Settings > GLOBAL and make sure, TFTP server and DHCP are ticked, everything else unticked, Save and Exit and then reopen tftpd64.exe for the saved changes!

Set a static IP on your Windows computer LAN port with the following

 192.168.1.2  (Keep this to 192.168.1.2 or tftpd wont work **IMPORTANT**)
 255.255.255.0 (**IMPORTANT**)
 192.168.1.1 (**IMPORTANT**)

Follow method 1 to enable TFTP, Once done keep the LAN on port 1 (internet port) and then you should see something transferring and then the RB750r2 will boot into OpenWrt, Unplug the LAN port from Internet port 1 and set a DHCP on your Windows machine and then plug in the LAN port into any port 2-5 and the Internet port for a Cable Modem? Switch? Router? something that has internet access to it if you want to keep the OpenWrt on as this is in RAM mode and won't save any changes!

Now, If you want to erase you RouterOS then follow theses steps;

Log into SSH 192.168.1.1 with just root and password been blank (press enter)

cd /tmp
wget http://downloads.lede-project.org/snapshots/targets/ar71xx/mikrotik/lede-ar71xx-mikrotik-rb-nor-flash-16M-squashfs-sysupgrade.bin
mtd erase firmware
mtd write -r lede-ar71xx-mikrotik-rb-nor-flash-16M-squashfs-sysupgrade.bin firmware

The device will reboot after flashing and will boot OpenWrt.

1. Download the sysupgrade.bin as shown in the table above
2. Go to System > Backup/Flash Firmware
3. Untick Keep settings
4. Click the Browse button and select the previously downloaded sysupgrade.bin image
5. Click the Flash Image button

Or use sysupgrade over SSH

Load initramfs-kernel.bin using TFTP like in step 1.

Only built in OpenWrt failsafe

1. Install the “rbcfg” package on in OpenWrt.
2. By terminal:
   

   root@OpenWrt:~#rbcfg set boot_protocol bootp
   root@OpenWrt:~#rbcfg set boot_device ethnand
   root@OpenWrt:~#rbcfg apply

3. Open Netinstall and reboot routerboard. Now netinstall sees routerboard and you can install RouterOS.

If NetInstall gets stuck on Sending offer just wait for it to timeout and then close and open Netinstall again. Click on install again

In order for RouterOS to function properly, you need to restore license for the device. You can do that by including license in NetInstall

Ports 2-5 directly correspond to ports 2-5 as labeled on the unit, port 1 is the Internet (WAN) on the unit, 0 is the internal connection to the CPU.

The MikroTik RB750P-PBr2 (PowerBox) has the following buttons:

Front:
Insert photo of front of the casing

Back:
Insert photo of back of the casing

Backside label:
Insert photo of backside label

Note: This will void your warranty!

Main PCB:
Insert photo of PCB

→ port.serial general information about the serial port, serial port cable, etc.

How to connect to the Serial Port of this specific device:
Insert photo of PCB with markings for serial port

→ port.jtag general information about the JTAG port, JTAG cable, etc.

How to connect to the JTAG Port of this specific device:
Insert photo of PCB with markings for JTAG port

• the bootloader is not initializing the serial PINs so the serial console wont work (until bootloader reflash)
• OpenWrt enables serial output from point of kernel loading

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