The TL-WDR7660 is a capable router, but its language barrier has frustrated thousands of users. To recap the safest path to English firmware:
Some older OpenWrt builds may lack proprietary Wi-Fi drivers, resulting in poor wireless performance. Look for builds labeled or community builds (often found on GitHub) that explicitly state they include drivers for the Qualcomm Atheros chipsets used in this router. tl-wdr7660 english firmware
Using English firmware on the TL-WDR7660 offers several advantages: The TL-WDR7660 is a capable router, but its