Firmware upload via MCU

W5200E01-M3 User’s Guide Version 1.0 - Flash Loader Demonstrator allows to upload firmware via Min-USB port.
Is there different way to upload the firmware?
Can Wiznet board firmware be uploaded via MCU? Which pin can be used to load the firmware to the Wiznet Board memory from MCU?

iEthernet W5200 Datasheet Version 1.4.0(*) tells.
Section 1.1.
DATA These pins are used to read and write register or memory data.

Could you help what it takes the MCU to upload firmware to Wiznet Board?
Thanks for your support in advance.