For newer versions of the TL-WR840N (usually v5 and above), you can use the TP-Link Tether app on Android or iOS. This method is easier but requires the router to be online.
The good news? Updating the firmware is free, takes about 10 minutes, and can feel like getting a brand-new router. tp link router firmware update tl-wr840n
Click . A warning will appear: "Are you sure you want to upgrade the firmware?" Click Yes . For newer versions of the TL-WR840N (usually v5
If an update is available, a red dot will appear—simply tap Need more help? Check out the official TP-Link FAQ for troubleshooting common errors like Error Code 18005 change your Wi-Fi password after this update? Download for TL-WR840N | TP-Link India takes about 10 minutes