@Solla-topee Would you help me ?

  @Solla-topee that's right, all other TP-LINK repeaters and routers could always be updated and if I didn't like it, I could go back, but the RE450 in its version 4 I updated it to version 1.0.4 because in my country still doesn't have this update version available, so I went to the US version and downloaded and updated manually, even because the US has bands and frequencies very similar to those of Brazil, no I would suffer so much, but I can't download the firmware, it only allows me to update from version 1.0.4 US version to version 1.0.4 EU in case I try to download version 1.0.3 from whatever country it is not accepted, well then according to your advice better leave it the way it is, it is working fine without problems, I just I really wanted to know if this was normal, or would I have caused it, and if I could go back to the previous version, I updated it because I have noticed a high temperature in my model, when used and stressed it gets too hot and with that it loses total performance causing my connection speed to drop drastically, so I saw a newer firmware version and tried the update to see if there would be any improvement, but the heating persists, I will continue to evaluate it, and if I cannot find any cause I will call TP-LINK support in my country and ask for a replacement.

  @Solla-topee strange not being able to downgrade the firmware, why would that be? and another question I have is why it is getting so hot , it is not normal , in fact it is normal to get hot , however the performance drops a lot from a constant speed of 200Mbps it doesn't go more than 85Mbps, turning off and  and restarting it on again a few minutes later the speed goes back to 200Mbps like a pass magic, are you sure it's not a defective product?