We would recommend you to visit below link before starting to do the manual firmware update. http://wiki.qnap.com/wiki/What_to_do_if_firmware_update_failed Regarding how to update the firmware manually via command line, you will have to upload the firmware image (e.g. TVS-X63_20151118-4.2.0.img) to a shared folder in the NAS (e.g. Public) first, and then execute several commands with SSH/Telnet. I