Hello bartman99,
I understand your imageCLASS MF4350 displays the error *BIOS Mode* Wait Updating F/W. Resetting your printer using the steps below should clear the error. By resetting the printer's power, the print buffer is cleared and certain sensors are reset. If there is invalid data in the buffer, or sensors are stuck in a particular mode; a message may appear.
Follow these steps to reset the printer:
1. Turn the printer off with the Power button.
2. Disconnect the USB cable from the printer.
3. Unplug the printer's power cord for at least ten minutes, and then plug it back in.
Note: If the power cord is plugged into a surge protector, it may be necessary (for testing purposes) to plug the cord directly into the wall outlet if possible.
4. Turn the printer back on.
5. Retry the operation.
If the message does not clear, unplug the printer for at least 24 hours.
If the issue persists, you have completed all of the steps that should restore your MF4350d to working as designed. At this point, your MF4350d will require service. Please contact us at 1-800-OK-CANON (1-800-652-2666) so that we may provide you with your service options.
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