Batch Firmware Update Using fdt2.exe

[jyijyi]

could it be PC problem?

Here says no problem to upgrade multiple modules:

Multiple module firmware update

Hi Wiviacom, USB port number is modem port in Sierra Wireless WWAN Modem. For example: usbport is 246 fdt2.exe -f WP76xx_Release16_GENERIC.spk -usbport 246 -multi [usbport]