ok here is a windows solution, (I think that will work with all chipsets)
Attention! there is a small bug. If you close the app your PC will freeze probably!!!
howto:1. boot into windows/vista
2. flip the switch to off position
3. plug in SATA cable
4. power on x360 or use the connectivity kit
5. flip the switch to on position (no hurry)
6. and now start DosFlash32.exe
7. scroll the posts and you will see "MX(25L2005)(3,3V)"
8. read/write the flash now!!

WOOT WOOT , I used this method with the dosflash 1.2beta and it actually dumped !! Now all i need to find out is how to actually extract the key and put it on a ms25 and spoof it!