Simple dongle for field updates via ISP6Pin

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Is there a stand alone dongle available that can be loaded with a flash file and then taken to a unit in the field to update the flash via the ISP6PIN header?

I am looking for something that does not require a PC and software to perform the update.

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Butterfly loaded with a copy of Buttload is one way to do this - you can program a firmware image into its on-board AT45 Dataflash then it'll do ISP to a board using that, completely stand-alone.

Failing that search for "avr key-fob"

EDIT: key-fob:

http://microcontrollershop.com/p...

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I use North Pole Engineering's Pocket Programmer.
http://www.npe-inc.com/ittrium/v...