Use this method if you can still access your router dashboard at 192.168.0.1 or http://tplinkwifi.net . Step 1: Physical Setup
Click to select the extracted .bin file you downloaded.
Under the model number, choose V3 from the dropdown menu. Click on the Firmware tab. Download the latest firmware available (e.g., Go to product viewer dialog for this item. (IN) V3_210407 Rel.7370n or similar 2021/2022 releases).
Connect your computer to one of the orange on the TL-WR850N V3 using an Ethernet cable.
Look for the latest build labeled for India, which includes fixes for local ISP compatibility, security vulnerabilities, and stability bugs.