Official firmware for the Canon imageRUNNER (iR) 2425 is exclusively distributed through the Canon Support Portal
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If your machine is not directly connected to the internet, manual updates are your next best option: Official firmware for the Canon imageRUNNER (iR) 2425
Step 2: Printer Preparation
This is the easiest method as the machine downloads the update directly from Canon's servers. On the operation panel, go to [System Management Settings] [Update Firmware] [Via Internet] and follow the on-screen instructions. 2. Manual Update via Remote UI and exclusive updates