To use the 'UMS Trick', take the battery out of your player, connect to the computer, reinsert battery, and while powering up, hold down the "o" key. Your H10 should now appear as a drive under 'My Computer'. To find the latest firmware for your H10, check out the '
H10_Firmware_Downloa ds' page on the iRiver Wiki here on MisticRiver.
-Adam