L14M333 added a NandTool to his iHc Xbox 360 util that packages a range of tools for homebrew 360s:

Here is my full release of iHc NandTool! a new feature to iHc Xbox 360 what allows you to everything you would want to do jtagging wise...

The NandTool program features:
-Small super clear and easy to use UI
-CB Checker
-Pre-Dump CB Checker
-Easy Read from Nand
-Easy Write to Nand
-Easy Extract RawKV/RawConfigBlocks
-Easy Inject RawKV/RawConfigBlocks
-standalone xellous (No CPU key required) with quick download and clear progress bar
-Easy Console and Device selection
-Easy Nand Dump Compare
-Easy FreeBOOT 0.032 Maker
-Custom nandpro commands
Official Site: forum.inhopecreations.co.uk (via se7ensins.com)
Download: n/a (some other iHc utils might be illegal under DMCA/EUCD)