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If you experience issues during the firmware update process, try the following:

If you’ve spent the last few weeks pulling your hair out trying to update your , you aren’t alone.

If the firmware update itself works (progress bar reaches 100%) but problems persist, the issue is hardware or settings, not the download.

Though rare, updates can reset custom shortcuts. It’s always smart to export your address book before updating. Conclusion

If you still see errors, clear your browser cache or use a private/incognito window to force Canon’s server to serve the new file.