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You can download driver for Canon CanoScan D1250U2F, D1250U2 ScanGear CS-U 631a here, but DriversKit`s Team strongly recommend you to use Driver Updater Pro for finding latest version of this driver. You can download Driver Updater Pro here.
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Search Canon CanoScan D1250U2F, D1250U2 ScanGear CS-U 631a driver at Google