I'm unable to block any other device as i have attached the screenshot of the the error appearing every single time

 

TP-LINK Archer C20

Firmware Version:0.9.1 3.16 v0001.0 Build 161130 Rel.68411n

Hardware Version:Archer C20 v4 00000004

 

Antenna

External Integrated

Built-in Devices

Antenna

Cables Included

Network Cable

Color

Black

Compliant Standards

FCC, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n

General

Connectivity Technology

Wired Connectivity, Wireless Connectivity

Data Link Protocol

Ethernet, Fast Ethernet, IEEE 802.11b

Data Transfer Rate

733 MBps

Depth

144.8 mm

Device Type

Wireless Router

Features

Dual Band, Firewall Protection, IPv6 Compatible, Stateful Packet Inspection (SPI), Wi-fi-protected Setup (WPS)

Max Operating Temperature

40°C max

Min Operating Temperature

0°C min

Network Transport Protocol

DDNS, IPsec, L2TP, PPTP

Power Device

External Power Adapter

Software Included

Drivers & Utilities

Width

231.1 mm wide

Wireless Speed Rating

AC750

Wireless Standard

Wireless-AC, Wireless-G, Wireless-N

Connectivity

Wireless

Encryption Type

WEP, WPA, WPA2