No, you can't use them, but I guess it's possible to disassemble / reverse engineer them, which is a good thing if it's put to good use, e.g. making custom firmwares or specific applications utilizing the hardware.
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Comment on: XXXX - DSXtreme 4Gb (UNIVERSAL) (128Mbit) (iND)
Any sort of custom firmware for the DS-X would probably be the best thing to have happened to the cart in its lifetime. "Official" firmware has been a joke.
If this release is akin to releasing source code, then I'm all for it.
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Comment on: XXXX - DSXtreme 4Gb (UNIVERSAL) (128Mbit) (iND)