EM7455B connection issues

[AndrewZ]

About FW upgrade:

Flashing Sierra EM7455 through WE826 Openwrt

This tool is not OpenWrt specific, you can find a lot of example on Internet. In fact, everything is very straightforward - just make the files accessible to the tool and run it like this: qmi-firmware-update -t /dev/ttyUSB0 -U filename.cwe filename.nvu (corrected as -u is not available) The upgrade is triggered with --dms-set-firmware-preference, see examples in qmi-firmware-update -H output.