Updating firmware of modem Sierra Wireless EM7455

[Pavlin Georgiev]

Hi,

I try to updated the firmware of modem Sierra Wireless EM7455.
Without success.

I download the latest version of libqmi from its Git repository.
I satisfy compilation prerequisites.
I compile and install libqmi without errors.
When the firmware starts, I see error:
Error: error downloading image: couldn't write in session: timed out 
waiting to write


_Testing environment_
OS: Fedora 27 (Twenty Seven)
kernel: 4.15.14-300.fc27.x86_64
qmi-firmware-update 1.21.0


_Hardware_
Model: EM7455
USB ID: 413c:81b6


_Firmware version_
Series: SW92x30
Firmware image: SWI9X30C_02.24.03.00.cwe
Firmware config: SWI9X30C_02.24.03.00_VODAFONE_001.001_000.nvu

_
Command_
qmi-firmware-update \
--update \
-d $USB_ID \
$FIRMWARE_IMG \
$FIRMWARE_CFG \
-L /tmp/qfu.log


What is the reason?
What troubleshooting steps can I take?

/Note: ///I am not a developer. /I do not understand the source code of 
libqmi./

Thank you in advance,
Pavlin Georgiev

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