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Before manipulating any firmware, confirm the hardware version. The v5 differs fundamentally from v4 and earlier.
| Feature | v4 (Old) | v5 (This Paper) | | :--- | :--- | :--- | | CPU | Qualcomm/Atheros QCA9533 | MediaTek MT7628NN (575/600 MHz) | | Flash | 8 MB SPI | 8 MB SPI (Winbond/ESMT) | | RAM | 64 MB DDR2 | 64 MB DDR2 (integrated into SoC) | | Ethernet | 10/100 Mbps (4+1) | 10/100 Mbps (4+1) | | USB | 2.0 Host (for 4G modem) | 2.0 Host (for 4G modem) |
How to check: Look at the bottom sticker. If it says Ver:5.0 or v5, follow this guide. Do not use v4 firmware. tplink mr3420 v5 firmware
The v5’s primary use case is LTE failover. Stock firmware supports:
Note: In OpenWrt/Padavan, you must install kmod-usb-net-cdc-ether and comgt to enable modem switching from storage to serial/network mode. The v5’s primary use case is LTE failover
If your goal is practical (flashing the router), note that the MR3420 v5 firmware often uses "SafeLoader". You cannot simply flash a .bin file directly without stripping the header if you are doing it via TFTP. You must use the specific factory.bin provided by OpenWrt or LibreMesh, which contains the special header the stock bootloader expects
Target Images: Select squashfs (standard for routers). Note: In OpenWrt/Padavan
Select Packages: Select the software you want (LuCI web interface, VPN support, etc.).