For the in India, the most reliable and safe firmware updates are found on the official TP-Link India Support Page . While third-party "fixed" files for 2021 exist on external platforms, using unofficial firmware can permanently damage your router and void your warranty. Official Firmware and Updates
From archived forum discussions:
Resolves initialization errors with ISP customization configurations. tplink tlwr850n v3 firmware download india fixed 2021
TP-Link TL-WR850N(IN) V3 Firmware Download India: Fixed 2021 Update Guide The TP-Link TL-WR850N(IN) V3 For the in India, the most reliable and
Some users reported that the "fixed" version still caused issues or that they could not access the settings. For the in India
Open a web browser (Chrome, Firefox, or Edge) and enter http://tplinkwifi.net or 192.168.0.1 in the address bar.