360Nandflasher is new tool by Maximus that alows you to dump your xbox360 nand,
 so you can flash it to run XBR-(running home brew ,linux,emulation and unlocking some  features of your console that have restrictions)
 or if you just want replace the key from your drive that was lost ,(you can recover it from the nand) 

To be able to use this tool you need to have an exploytable dash board version dash "7371"(this dashboard information can be found in your "console settings"on your xbox360.
software and install info can be found on the official website http://www.360nandflasher.com in the download section 

Compatible with Nandpro v2.0d for reading and writing to all mainboard versions (Xenon, Falcon, Zephyr, Opus, & Jasper) on consoles that are xploitable, meaning kernel 7xxx or lower, manufactured before Jun 18, 2009 and has not been to a a MS repair center since June 12, 2009

Feature List (Final list of features released soon):

• Works with Nandpro 2.0 or later
• Professionally manufactured PCB
• Standard USB port
• Power LED is blue for normal operation
• Works will 360 Mainboards and all flash sizes
• 360nandflasher come with 1 free install kit

nandflasher installation from vgc repairs on Vimeo.