I have an Xbox 360 Elite and I want to downgrade the dashboard version from 2.x to 9199. I tried putting $SystemUpdate (from the official $SystemUpdate9199.zip) folder into a FAT32 formatted USB and restarting the console with the USB stick inserted, but it didn't work. What else can I do?

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Out of interest, Why? – Diago Feb 24 '11 at 13:16
@Diago: It's about JTAG. – Mehper C. Palavuzlar Feb 24 '11 at 13:54
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2 Answers

up vote 5 down vote accepted

There is no easy way of downgrading Xbox 360 Dashboard, since there are physical measures put in place to prevent just that (CPU e-Fuses blow when upgraded to prevent downgrade).

I heard there is a possibility of downgrading certain Dashboard versions by a timing attack, but that requires advanced electronics knowledge (and equipment) and definetly voids your warranty.

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Basically what you have to do is JTAG your Xbox, then it will work. I'm no expert so double check on YouTube or something. I'm pretty sure, though!

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