: Always export your current settings before flashing new firmware to ensure you can restore your internet connection quickly.
The F670L lacks a reliable recovery if bootloader corrupts (no JTAG publicly documented). Always verify MD5 of .upd against ISP’s original before flashing. For most users, the risk exceeds the reward – unless you have a TTL serial adapter and a backup of your original mtdblocks. zte f670l firmware update upd install
If the standard Web UI does not allow the update, the (often hidden) may be required. : Always export your current settings before flashing