If you are using fwdwl application in boot and hold mode, you need to add “-c QMI” parameter:
owner@ubuntu:~/QMI/MBPL/MBPL_SDK_R32_ENG2-fwdwl.bin/SampleApps/lite-fw-download$ sudo ./bin/fwdwl-litehostx86_64 -c QMI -m 4 -d /dev/ttyUSB0 -f /home/owner/Desktop/FW_WP76/
Application version: 1.0.2303.0
INFO: QDL Port: /dev/ttyUSB0
INFO: Device Path:
INFO: FW Path: /home/owner/Desktop/FW_WP76/
Modem is already in QDL mode. Continuing FW download.
Waiting for modem to come up in BOOT and HOLD mode ...
BOOT and HOLD Mode. Downloading firmware ...
Downloading: /home/owner/Desktop/FW_WP76//WP76xx_Release16.0.1_GENERIC.spk
All image data was downloaded successfully.
Device is about to reset ...
Waiting for modem to come up in ONLINE mode ...