If an OTA update isn't available, you may need to flash the firmware manually using a PC.
If the official sites don't have it, technical forums are your best bet. Look for threads on sites like: zl782mbv21 firmware download best
If an OTA update isn't available, you may need to flash the firmware manually using a PC.
If the official sites don't have it, technical forums are your best bet. Look for threads on sites like: