| Component | Specification | |-----------|---------------| | | MediaTek MT7628NN @ 575 MHz (MIPS 24KEc) | | RAM | 64 MB (DDR2) | | Flash | 8 MB (SPI NOR) | | Switch | Built-in (MT7628 integrated 5-port FE switch) | | WiFi | 2.4 GHz 802.11n (2T2R, max 300 Mbps) – no 5 GHz | | USB | USB 2.0 (supports 3G/4G modems, storage) | | Antennas | 2x fixed external (RP-SMA on some regional variants) | Critical Note: v5 is not hardware-compatible with v1–v4 firmware. Flashing older firmware will brick the device. 3. Stock Firmware Analysis 3.1. Version Naming Convention Official firmware follows the pattern: MR3420v5_up_boot_[version]_[date].bin
Report Date: 2026-04-17 Subject Device: TP-Link MR3420 v5 (300Mbps Wireless N Router) Report Author: Network Firmware Analyst 1. Executive Summary The TP-Link MR3420 v5 is a budget-friendly 3G/4G wireless router designed for SOHO (Small Office/Home Office) and travel use. Unlike its earlier versions (v1–v4) which featured Atheros chipsets, the v5 hardware revision utilizes a MediaTek (Ralink) MT7628NN system-on-chip (SoC). This change significantly alters the firmware landscape, limiting third-party support (e.g., OpenWrt) and imposing strict size and compatibility constraints. This report provides a comprehensive analysis of stock firmware features, hardware identifiers, security considerations, and the feasibility of custom firmware replacement. 2. Hardware Profile (v5 Specific) Understanding the hardware is critical for firmware selection. tp-link mr3420 v5 firmware