Wait for the interface to display a "Connected" status for the device. : Click RUN to start the flashing process.

: Ensure you have executed the SCSI.exe or similar utility included in many firmware packages to "switch" the device into a mode where its COM ports are visible.

to a PC via USB often triggers an automatic software installation. If it doesn't, you can manually run the installer found in the drive in "My Computer". ZTE Support Downloads:

It is the built-in utility that allows the MF927U 4G LTE hotspot to communicate with ZTE's servers to download and install "Firmware Over-the-Air" (FOTA) updates. These updates typically improve connection stability, fix security vulnerabilities, or add support for new network bands.