> > unknown descriptor type: 07 21 07 88 13 ff 03
> Descriptor type 0x21, length 0x07 ... :)

This is a DFU (Device Firmware Upgrade) functional descriptor. See table 4.2
http://www.usb.org/developers/devclass_docs/usbdfu10.pdf

I believe I've seen once a patch for lsusb to handle DFU-related stuff. 

HTH,
Dmitri




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