Here is informational content regarding the , structured for a knowledge base or support article. Tenda D301 v4 Firmware: Complete Guide The Tenda D301 v4 is an ADSL2+ modem router combo designed for VDSL/ADSL connections. Keeping its firmware up to date is critical for internet stability, security, and unlocking new features. Identifying Your Hardware Version Crucial: Before downloading any firmware, verify you have the v4 hardware. Using the wrong version (v1, v2, v3) will brick your device.