Format USB drive as FAT32. Extract firmware files to the root of the USB.
When you search for "canon ir 2425 firmware download" , you almost always want the package, which includes the RUI and network fixes. canon ir 2425 firmware download
Generally, no. Canon prevents downgrades to avoid security risks. The update tool will reject older versions. The only exception is via a specialized service mode (service technicians only). Format USB drive as FAT32