A loss of power during a firmware update is one of the most common causes of a "bricked" device. If your printer loses power while writing new system software, it may fail to start up again. Make sure the device is plugged into a reliable power source and, if possible, a UPS (Uninterruptible Power Supply) to safeguard against any fluctuations.
If you encounter issues during the process, check these common fixes: Updating the Firmware - Canon - imageRUNNER 2425 II
: Download the firmware to a computer that can connect to the printer.