I am trying to upgrade firmware via USB serial port for the modem HL7692. However I am getting the below Ebl Checksum error when trying to complete this. The version that I am trying to update to is 2.27. The version currently on the modem is 2.24.
I have downloaded and installed the firmware upgrade tool: https://source.sierrawireless.com/resources/airprime/software/airprime---hl75xx-hl76xx-series---firmware-upgrader-tool/
I also have installed the USB drivers: https://source.sierrawireless.com/resources/airprime/software/hl854x-usb-drivers/
I can contact the modem currently using AT commands via TerraTerm.
Another point to note is that before running the .exe file for upgrading to version 2.27. I edit the .bat file to the baud rate of 115200 and the port to COM12 which is what the device has been set to.
Can anyone point me in the right direction or have any idea as to what may be wrong?