3.16.0 0.9.1 V6031.0 Build 210407 Rel.7370n -tl-wr850n- Jun 2026

The April 2021 release was a significant "stability build" for the WR850N. Since this model is often deployed by ISPs in high volumes, TP-Link focused this update on three key areas: 1. Improved Wireless Stability

If you have logged into your TP-Link router’s dashboard or checked the "System Tools" section recently, you might have seen the daunting string: 3.16.0 0.9.1 v6031.0 Build 210407 Rel.7370n . To the average user, this looks like random numbers. To a network engineer, this is a roadmap of your device's software lifecycle. 3.16.0 0.9.1 v6031.0 Build 210407 Rel.7370n -TL-WR850N-

If you have this firmware, your TP-Link TL-WR850N is functioning as intended at the time of its last official support window (April 2021). It is time to consider upgrading to a Wi-Fi 5 (AC) or Wi-Fi 6 (AX) router if you need modern security, but as a legacy device, Build 210407 is the best you will ever get. The April 2021 release was a significant "stability

As of early 2026, the TL-WR850N has been flagged for several critical vulnerabilities that affect older firmware builds: 3.16.0 0.9.1 v6031.0 Build 210407 Rel.7370n (TL-WR850N) To the average user, this looks like random numbers