@Johncut 

Hi,

Do you remember the version number of the firmware that was previously on the TL-PA4010 ?

The TP-Link firmware download page states that the version you have "upgraded" to is the "First firmware released". Or in other words, it is the "original firmware". 

https://www.tp-link.com/en/support/download/tl-pa4010/#Firmware

By the way, can you please verify on the stickers on the backside of your TL-WPA4220 and TL-PA4010 that they are indeed the "EU" version?

  @woozle 

Thanks for the reply.

No sadly, I don't remember the initial firmware version. I could've check it on the tpPLC app but at the time I didn't know to do so.

The link that you gave me the one I upgraded to. I checked the label and I'm sure of it. It is the EU version TL-PA4010 V3 that comes with the kit.

What is interesting to me is that tpPLC app still shows me the speed I get before the firmware update.

However, what I get is third of it. It is like it stucks at that download speed and never passes it.

Another thing that I want to mention is there is no problem with the upload speed at all.

The plug location is the same as well. Never changed it to diagnoise better.

I'm assuming that the firmware upgrade causes the problem but I can't be sure of it.

Did you heard anything like that before?

Have any idea what going on?

I'd be greatful if you'd help me.

Thanks in advice.