Updated successfully iDeneb 10.5.6 to 10.5.7.
Steps to update:
1. backup your voodoo kernel (sudo cp/mach_kernel /mach_kernel.voodoo)
2. update with apple's software update
3. on the next boot, boot with mach_kernel.voodoo
4. copy the voodoo kernel over the original apple kernel (cp /mach_kernel.voodoo /mach_kernel)