To update the firmware of your TP-Link Archer C5 V4 , you can use the web management interface or the TP-Link Tether App.  Critical First Step: Identify Your Router Type 

has been "disappearing" from your devices, updates often solve these known stability issues Step 1: Verify Your Hardware Version Before downloading anything, ensure you actually have Version 4 (v4)

TP-Link Archer C5 v4 Firmware Update: A Comprehensive Guide

Updating the firmware on your TP-Link Archer C5 v4 is essential for maintaining network security, fixing bugs, and occasionally gaining access to new features. However, the v4 hardware revision has a specific update path that differs from newer TP-Link routers, often causing confusion for users attempting to use the Tether app or modern web interfaces.

After updating to the latest firmware, we noticed significant improvements in the router's performance and stability. The wireless signal strength and coverage were improved, and we experienced fewer dropped connections. The router also handled multiple devices and applications with ease, without any noticeable lag or slowdowns.

Part 9: The Future of the Archer C5 v4

TP-Link officially announced "End of Life" (EOL) for the Archer C5 v4? Not yet, but it is nearing. As of 2025, TP-Link still provides critical security updates, but feature updates have slowed. If you check the support page and see no new firmware for over 18 months, it is a sign to start planning for a replacement (e.g., the Archer AX53 or Deco X20).