Sierra Wireless EM7565 -- Restoring the Modem COM Port for AT Commands

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JimHelms
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Sierra Wireless EM7565 -- Restoring the Modem COM Port for AT Commands

Post by JimHelms » Sun Jan 27, 2019 5:04 pm

This tutorial will demonstrate a fairly easy way to restore the Sierra Wireless modem COM port using a Windows machine. While we will be working with the Sierra Wireless EM7565 modem, the same procedure works for the MC7455 and other Sierra Wireless modems.


DISCLAIMER: As with all the tutorials, use at your own risk.

Most users who routinely tweak and/or configure Sierra Wireless modems for various applications have (or will) experience the loss of the modem COM port. One such event is where the modem is stuck in QDLoader mode while waiting for a firmware to be loaded and/or updated:

QDLoader COM Port.png

While I am on the subject, I recommend to NOT USE the Huawei Modem Terminal to program the EM7565. I use the terminal only to find what COM Port number is assigned to the WWAN MODEM interface.

I then use PuTTY in Serial mode to execute AT Commands required (if at all) to configure the EM7565 modem.

Use PuTTY EM7565.png


Since we will be using a Windows machine to restore the modem COM port, a USB to M.2 (NGFF) adapter or enclosure is required to connect the EM7564 to a USB port on the Windows PC.

NOTE: It is recommended to never allow Windows to establish an internet connection with a Sierra Wireless modem that is intended to be used with GoldenOrb router or a Linux machine. Windows, being the control freak that it is, has a habit of placing the modem in an undesired composition.

Download and the latest Sierra Wireless Generic Drivers for Windows. This will allow Windows to communicate with the modem.

Also needed is the latest Sierra Wireless EM7565 Generic Firmware.

Note: The firmware in the download link are labeled as GN#. The higher the number, the newer the firmware.

Since we will be extracting (unzipping) the Generic Modem GN# firmware, a software extraction tool is required to unzip the firmware. 7-Zip is free and works well for this task.

Place the Generic Modem GN#...exe firmware into a folder on your desktop.

Right click the GN# firmware, and using 7-Zip, select Extract Here:

Extracting the EM7565 Firmware.png

The extracted GN# Firmware will consist of five files. We will be use the fdt2.exe to restore our modem port.

EM7565 Firmware Extracted.png

Install the EM7565 into the USB to M.2 adapter and plug it into the Windows Machine.


Next, install the Generic Drivers (double left clicking the exe file) to allow Windows to communicate with the modem.

Installing Windows Drivers.png
Installing Windows Drivers.png (52.91 KiB) Viewed 1369 times

Once the Generic Drivers have finished installing, execute the fdt2.exe file in your extracted firmware folder:

It takes a minute or two to complete the process so just be patient.

EM7565 Firmware Updating.png

Once completed, press the Enter key to close the update Window.

If all went correctly, the WWAN Modem COM Port should be restored:

Modem COM Port Restored.png

Once the Modem port is restored, I would recommend flashing the modem one more time using the OEM (zipped) GN# Sierra Wireless firmware.

DONE!

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