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Canon Pixma Pro 100 - Botched Firmware Update
Canon recently release firmware v1.3 for their Pixma Pro 100 and similar printers. The update doesn't work for many users including me as described in this link Canon pro-100 firmware upgrade from 1.1 to 2031 - Page 4 - Canon Community
I've concluded Canon have botched this update so be warned before you attempt the update. Fortunately my printer still works.