Having an issue similar to this except Sentinel does not see my HP-1 at all. Never has so the Clear user data would not be an option for a fix. Frustrating indeed.How can I get the Sd card back to it's original configuration. I do not have the option of choosing Mass or Serial mode as well. When fired up the HP just tells me it has an SD card failure and to remove power for 1 minute and then if it persists to use the method you describe here but I am unable to even get to this point. Disappointing as this in a one day old scanner.