Back up your current settings or personal data from the modem's web interface.
: Ensure your power source is stable. Interrupting a firmware flash can permanently disable the modem. How to Check Modem Firmware - CenturyLink Zte Modem Firmware Update Tool
: These tools usually require you to unplug the modem, remove the SIM card, and then run the file to detect and flash the device [6]. Critical Safety Tips Back Up Settings Back up your current settings or personal data