If you encounter issues during the firmware update process:
A legitimate file looks like: ZTEF670LV3.0.0P1N6_UPGRADE_BOOTLDR.upd or F670L_UPDATE_V7.0.2.upd . If you see firmware.exe – delete it immediately. zte f670l firmware update upd install
If you have obtained a valid firmware file (usually a .bin file) from your ISP or a trusted repository: If you encounter issues during the firmware update
Update wisely.
A: Usually, no – LOID is stored in a separate NVRAM partition. However, some .upd files reformat the entire flash. Always backup your LOID (found in Network → Remote Management → LOID ). zte f670l firmware update upd install