@TP-Link Thx for checking back. All is fine, I was just confused about firmware version.

Update on the thread. My store accepted RMA and returned the money. I picked up a new Deco M4R which now has 1.4.3 firmware - 1.4.3 Build 20200918 Rel. 74289. My other two M4R Deco's are on 1.5.0...

@TP-Link I actually got it from one of the biggest online retailers in Poland. I've bought from them a lot of electronics over years without any issues. Here's direct link to this unit in their...

I own a set of three Deco M4R's. I've bought two of them together and one more separately. Those two that came together I was able to successfully upgrade to the latest firmware. However, this...