A user trusted device and a software update method for updating the device. The device includes: a connection interface enabling connection with a host computer; a persistent memory storing a boot enabling data structure and a network updater, wherein: the network updater is configured to interact with firmware of the host computer to initiate communication over a network; and the boot enabling data structure: is detectable by the firmware upon connection of the user trusted device with the host computer; is such that host computer can boot from the user trusted device, as per the data structure of the boot enabling data structure; and includes instructions for the firmware to initiate a transfer of the network updater on the host computer for subsequent execution, upon the host computer booting from the user trusted device.