Architecture and method for updating firmware of storage device

The invention provides an architecture and method for updating firmware storage device. The architecture comprises a host device and at least one storage device. The host device comprises at least one first firmware. The storage device comprises a controller and a first storage unit. The host device can transmit the first firmware to the storage device. The controller loads the first firmware to the first storage device, and executes an operation action according to the behavior defined by the first firmware. In such the way, the storage device in the boot operating can receive the first firmware provided from the host device, and thus update firmware to increase the convenience of updating firmware. Besides, the first firmware will be removed from the storage device when the storage device is in shutdown state so as to avoid other unauthorized host device to random access the date of the storage device by the first firmware.