Some issues with Speedport Smart 4 (details in commment section) : r/germany
Telekom Speedport Smart 3 in White | Base for WLAN Mesh, Magenta SmartHome Integrated Fast WLAN up to 2500 Mbps and Improved Range for MagentaTV: Amazon.de: Computer & Accessories
T-SPEEDPORT SM4: WiFi Router 2.4 - 5 GHz 6000 MBit - s at reichelt elektronik
Juniper: RealTek vulnerabilities CVE-2021-35394 and CVE-2021-35395 are attacked in the wild – Born's Tech and Windows World