In that case (recognized as a disk drive), you did not successfully bring it into USB Downloader mode. That might be due to hardware defect (Power button, which can be replaced by reconnecting the battery, or Vol- button), but are you really sure you understood under what circumstancces you were supposed to press what button? It's pretty simple, actually: The volume-down ("Vol-") button must be pressed and hold for a moment during system boot-up/reset. The device should be shown as "SE Blank Ringo" when that was successful.
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