Follow these steps in order to gain a dual boot Rockbox/Original firmware H10

• Plug your H10 into your computer in UMS mode by holding the "o" button while turning the power on.
• In the "system" folder* on your H10, rename what ever file you have there with the ending .mi4 to OF.mi4.
• Download the appropriate boot loader from my bootloader section of the website found above
• Extract the bootloader to the system folder of your H10
• Download a "build" either from the home page of my site, or go to http://www.rockbox.org and on the top left click on "current"
• Extract the "build" to the root of your H10
• The manual can be found at http://www.rockbox.org/manual.shtml please take a look before you ask questions!
  

*in order to view the "system" folder on your H10 you must be able to view hidden folders

• Open any folder in Explorer.
• Choose "Tools" then "Folder Options".
• When the multi-tabbed dialog box appears, select the "View" tab.
• Select "Show hidden files and folders".
• Click "OK" to close the dialog box.