MODFREAKz released a new version of 360 Flash Dump Tool(info)(info), an application that will allow you to decrypt/encrypt and extract various parts of a XBOX360 flash dump and much more!!

What's new/fixed:
* Added Support for Large Block nands (Jasper 256MB and 512MB nands)
* Added Support for DevKit images + region for DevKit
* Added Support for XBR/ZeroPaired images (still in development)
* Added Single CPU Key or Multiple CPU Key handling (max. 25 Keys)
* Added simple state indication via Progress Bar
* Added ability to display Bad Blocks with true image offsets
* Fixed bug in reading 7BL (CG) that have more blocks than specified in 6BL (CF)
* Fixed bug in reading bootloaders that are smaller than 1 block
* Fixed bug in kernel extract log with double slashes, more accurate extract log
* Fixed multiple memory leaks
* Fixed application can now start without Administrator Rights or UAC enabled
* Updated config block logic with new info
* Changed appearance for more read comfort

Official Site: n/a, by MODFREAKz
Download: here
News-Source: xboxhacker.org