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Flash OpenWRT onto Mikrotik RB750Gr3

Introduction

Mikrotik is a very popular supplier of networking equipment.
They have their own operating system called RouterOS which most probably is Linux based.
RouterOS however is licensed and includes different levels of licensing for different functionalities.
To unlock a needed feature not included with the current license then requires you to upgrade which obviously involves cost.
However, the hardware itself is good and durable and it is easy to source all over the world.
Some of their models are also able to run OpenWRT as an alternative to RouterOS.
OpenWRT is OpenSource and there is no paid for licensing involved on OpenWRT.
This page will just cover the flash from RouterOS to OpenWRT.
We will cover the configuration of the device once OpenWRT is running on it on a separate page.

Linux based machine to communicate with the Mikrotik and supply the OpenWRT firmware over the network.
Mikrotik RB750Gr3 reset to factory defaults
1xCat5 LAN cable.

The flash process is fairly simple and straight forward and involves three steps
1. Export the RouterOS License Key.
2. Load a RAM based version of OpenWRT.
3. Flash the permanent (Flash) version of OpenWRT using the RAM based version.

It is recommended that you export the RouterOS license key in the event of returning to the original RouterOS, you might need to use it again to activate the RouterOS.
RouterOS can be accesses various ways which include
- Web based UI (default http://192.168.88.1) on the LAN side of the board
- Using the Winbox application.
Unfortunately the