Hello Jaap, On Thursday 29 March 2012 01:51:21 Jaap Winius wrote: > Okay, thanks; so now I know that it's not just badly designed hardware > that may do this. My device, however, is not a smart-phone or some > other consumer device: it's a scanner with a rotating drum on which to > mount flexible, reusable photographic plates from an X-ray machine. > It's rather expensive too. Of course, it only works with a Windows > application. Can you imagine a legitimate reason why a machine like > this might keep flipping its product ID? I know of some USB devices which use this trick to load there firmware: Initially the start without a firmware (so the manufacurer doesn't need to put a flash chip on the device) an USB-ID A. Windows detects the device using the ID and uploads the firmware to the device, which then soft-resets itself and re-appears with USB-ID B. Sincerely Philipp -- Philipp Hahn Open Source Software Engineer hahn univention de Univention GmbH be open. fon: +49 421 22 232- 0 Mary-Somerville-Str.1 D-28359 Bremen fax: +49 421 22 232-99 http://www.univention.de/
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