Replace the router. The TL-WR850N v3 lacks:
If you have a retail version, you can perform a manual update using the following steps: 1. Pre-Update Preparation
) and look at the bottom of the status page for the hardware version. 2. Download the Correct Firmware Visit the official TP-Link Download Center and search for from the dropdown menu. Download the latest firmware file (e.g., TL-WR850N(US)_V3_0.9.1 Build 251205 or similar). Extract the file:
to use a wired Ethernet connection for this process; updating over Wi-Fi can lead to a "bricked" router if the connection drops. Download for TL-WR850N | TP-Link India
It is highly recommended to perform the update via an Ethernet cable rather than Wi-Fi to prevent disconnection during the process.