: Look at the label on the bottom of your router. It will specify a version like V2, V5, or V6.20 download firmware that matches this exact version. Check Region Codes
Related search suggestions (optional) I'll provide a few related search terms to explore firmware files, hardware revisions, and rollback instructions. tp link router firmware update tl-wr840n
Connect your computer to the router via an (highly recommended over Wi-Fi to prevent disconnects during the flash). : Look at the label on the bottom of your router
If your TL-WR840N is very old (v1/v2) and stable, you may not need a firmware update. Newer firmware often adds security patches and bug fixes, but updates on low-end routers carry a small risk. Always follow the official guide from TP-Link. tp link router firmware update tl-wr840n