Firmware Update Link — Tenda D305

Alternatively: If you cannot find it on the global site, check your regional Tenda site (e.g., Tenda UK or Tenda Australia), as DSL standards vary by country.

Before you begin, ensure you follow these safety rules to avoid damaging your device: Use a Wired Connection Tenda D305 Firmware Update

The D305 is not officially supported by OpenWrt, but similar chipsets exist. You would need: Alternatively: If you cannot find it on the