Upgrade 10.5.1 to 10.5.6

I had no trouble updating from kalyway 10.5.1 to 10.5.6 using the combo update and the netkas method, worked great for me doing the following steps:
back up your extensions/data
Install pc-efi 9 very reliable boot loader from http://pcwizcomputer.com/index.php?option=...0&Itemid=48 open tools folder install bootloader.pkg. Ignore the dsdt stuff.
1. open directory utility enable root user from menu. set password.
2. open terminal type sudo su. enter password
3. in terminal typed without quotes. Enter.
"while sleep 1 ; do rm -rf /System/Library/Extensions/AppleIntelCPUPowerManagement.kext ; done"
4.mount 10.5.6 combo, install while monitoring for appleintelcpupowermanagement.kext in extensions folder. Should appear and get deleted super fast. do not restart!
5. right click /System/InstallAtStartup folder. Get info. at bottom click lock and enter password. change permissions for everyone to read/write. Repeat step for folder /System/InstallAtStartup/scripts and for file /System/InstallAtStartup/scripts/1
6. Open 1 file in text edit. Find there Dont Steal Mac OS X.kext and replace with this dsmos.kext. save file.
7. if u have nvidia card move to trash all ati* and appleintelgma* kexts to trash.
8. Install voodoo kernel 9.5 with their setup package. http://code.google.com/p/xnu-dev/ only if u know you cannot use vanilla kernels on your hardware.
9. restart!
This worked great for me and i have tested it several times.