Finding the correct firmware for your TP-Link TL-WR850N is the best way to fix connectivity bugs, patch security vulnerabilities, and sometimes even unlock better speeds.
: Look at the label on the bottom of your router. The version is usually listed next to the model name (e.g., "Ver: 2.0" or "V2"). Official Download Pages by Version : TL-WR850N V1 TL-WR850N V2 TL-WR850N V3 ISP-Customized Devices tp link tl wr850n firmware download
Never update firmware over Wi-Fi. A connection drop during the process will ruin the router. Finding the correct firmware for your TP-Link TL-WR850N