@SagaxRabbit 

TPlink South Africa should be contacted and provide the middle firmware for ZA-N to EU.

Since this is retail product and firmware they should do it.

https://www.tp-link.com/za/support/contact-technical-support/

Meanwhile, I had another thought that upgrades may work with simcard temporarily ejected or combined with a factory reset .

I even started typing a tftp flashing method only to find that mr600 doesn't support it.

  @ng6333 

Yes, I have found out that the MR600 doesn't have a recovery method. Was fun to play around with though.

Problem has been solved, for my router at least, though probably not the way it is intended to be resolved. I have bricked the router in an attempt to force a non-existant recovery mode, so now the lights on the unit don't even come on.

I might have a look at trying to get it going again, or failing that it is destined for the e-waste bin. Only way to get it going now is probably through the onboard connector using an UART interface, and I don't have the necessary hardware nor the time and energy to go that route.
 

I have purchased myself another router (different brand though) and will be using that as my main router going forward. 

Thank you though for your effort to try and assist me with the problem, it is much appreciated.

  @SagaxRabbit 

Maybe this will unbrick it

https://community.tp-link.com/en/home/forum/topic/706276?replyId=1422898

I read yesterday, It will take openwrt fw , and from there you can re-flash stock fw.