This tool unlock bml5 to allow writing of kernel with a simple "dd" command.
You can find also a basic update.zip for CWM that :
- Make backup of the current current
- Flash new kernel
The bmlunlock tool is in kernel_updater.zip.
How to use :
Put your zImage in the update.zip. Then, use CWM and install zip.
This tool was made by Koush (Thank to him ): http://forum.xda-developers.com/showthread.php?t=767431
also Thanks to Supercurio for the updater idea.