solved

After provider increased the speed from 100/20 tio 500/250 the speed over the deco m5 is still 100/20 (via speedtest). The speed measured via provider's router (wire and wifi) is 500/250. What is...

@Zagreb Any idea ?

@TP-Link Yes, I tried Bridge mode but without result

@TP-Link Yes, STP works with speedport plus directly without any additional setting. In the attachment I send you provider router IPTV setting. I do not know answer to yor last question

@TP-Link Hi, Yes, I read your FAQ. So, I have main deco which is connected (utp) with provider router (first floor). On the second floor I have satellite deco connected with provider STB device...