Cybercriminals constantly scan for routers with known vulnerabilities. Older firmware on the TL-WR840N may contain exploits that allow hackers to hijack your DNS, steal login credentials, or enroll your router into a botnet. TP-Link regularly releases patches to fix these security holes.
Use a tool like WinZip or WinRAR to unzip the folder. You are looking for a .bin file. 2. Access the Router Interface TP-Link Router Bricked | Firmware Recovery Steps tp link router firmware update tl-wr840n
Use an Ethernet cable to connect your computer directly to one of the router's LAN ports. Updating over Wi-Fi is risky because a momentary signal drop can "brick" the router 1.2.9, 1.4.6 . steal login credentials