Official firmware is generally distributed through authorized Canon service portals. However, generic tools and drivers are available on public support pages: Official Support Page: Canon imageRUNNER ADVANCE 4245 Support Page to find the latest firmware update tools and drivers. Firmware Update Tool: Canon often provides a dedicated Firmware Update Tool
Look for the tab. If available for your account type, download the executable or compressed file (.zip). Method B: Canon Content Delivery System (CDS) canon iradv 4245 firmware download install