Upgrading to a higher OS version from H/PC Pro always requires a hardware upgrade - you'd have to replace the ROM chip with one loaded with the higher OS version. However, these upgrades are not available with every device. If your tablet is a Fujitsu PenCentra 200 or an Intermec 6651, then you have a chance - if you can find the ROM chip on eBay or somewhere else. Which device do you have?