Unbrick SIM Card Router with uBoot

What is A Bricked Router

A bricked router has a broken firmware system and is stuck in the power on & off cycle but can not successfully boot up. The router’s system indicator usually flashes rapidly, and WiFi Mobile indicators will not turn on. The bricked router is generally because an incorrect firmware flashed or lost electric power while flashing, upgrading firmware, or resetting the router.

Note: The below tutorial is applicable for Ezen-4X routers, including EZR34 and EZR24 series SIM card routers. The Ezen-3X, such as EZR23 and EZR33L, are not suitable.

Preparation Before Unbrick SIM Card Router

The Ezen-4X routers have the uBoot bootloader to rebuild the firmware system and rescue the SIM card router from brick mode.

Firstly, please prepare a LAN cable and a computer or laptop with an Ethernet port.

Then download the correct 4X firmware file on the link below for Ezen-4X models.
https://www.outdoorrouter.com/4x-series-firmware-releases-and-tutorials/

1. Static LAN Connection

Connect a computer to the LAN port on the router. Then, configure the below static IP address on the computer.

Computer IP: 192.168.1.110 (Inside the default DHCP range of 100~249)
Subnet Mask: 255.255.255.0 (also called 24 on Windows)
Gateway (Router IP): 192.168.1.1

2. Enter uBoot Mode

i. First, disconnect the router from the power supply.

ii. Press and hold the “Reset” button on the router, and then connect to the power supply.

iii. Keep holding the reset button for about 5 seconds, and the LAN port indicator will turn on and flash, then release it.

Now we should be able to access the uBoot interface on a web browser by visiting 192.168.1.1. Same as the below image shows.

Note: If not showing the uBoot interface, please change to another web browser or try to clean the cache and cookie on the web browser.

3. Rebuild the Router Firmware

i. Click the “Choose file” button to load the previously downloaded firmware file.
Note: The correct firmware file should end with *.bin. Do not unzip or modify its contents.

ii. Click the “Update firmware” button to flash the firmware.

iii. Wait 5 minutes until the uBoot flashes the new firmware, and then the router will reboot automatically.

Change the computer network IP to the DHCP client mode, and the computer will obtain the correct local IP from the router.