You will need 3 things in order to build this usb stick successfully..
- 1 - A usb stick (or drive) large enough to contain the contents of the install image (8 gig should do)
- 2 - A downloaded copy of the Mountain Lion Developer Preview (don't ask me for it) - Instructions for the GM and the latest package can be found at the bottom of this post.
- 3 - The 2 packages from the this download http://www.mediafire...ckof84odvuircg2
Ok Moving on..
- First step (pretty obvious) Boot into Snow Leopard or Lion
- Use disk utility to format your USB stick or drive as mac os extended with GUID partition table (or mbr - doesn't matter as the package will patch the installer for mbr anyway)
- right click your Mountain Lion image and select 'open with DiskImageMounter',
- Run ShowAllFiles (to show hidden files),
- Open finder and look for Mac OS X Install ESD,
- right click on the hidden 'BaseSystem.dmg' and select 'open with disk utility',
- In disk utility look to the bottom left to find 'BaseSystem.dmg', right click it and select 'Restore',
- Drag your formatted USB stick or drive into the 'destination' box, untick 'erase destination' and click 'Restore',
- Go for a beer, coffee or whatever takes your fancy as this will take a while!
- Once restore is complete go to the system, installation folder on the usb stick or drive and delete the 'Packages' alias
- right click your Mountain Lion image and select 'open with DiskImageMounter' (from step 3) and again 'open with DiskImageMounter'
- Open finder and look for Mac OS X Install ESD (be careful here as you will have 2 drives with the same name - your original 10.6 ESD and your new USB drive - I recommend renaming the USB drive at this point)
- Double click the 'InstallESD.dmg' to mount it
- Copy the 'Packages' folder from the 'MacOS X ESD' folder that should automatically open in finder over to the system, installation folder on your usb stick or drive to replace the alias that you deleted in step 10,
- WAIT for Step 14 to complete and then run the downloaded 'P8P67 Pro USB Installer' package and select your usb drive as the target - this will make the drive bootable and install everything onto the drive to allow you to install on your P8P67 Pro
- Congratulations your USB stick or drive should now be bootable and allow you to install Mountain Lion!
- Boot from the newly created Mountain Lion installation USB stick and run the installer (use F8 after post to select the USB stick, let it run the installer and install as usual)
- Once installation is complete reboot and again boot from the usb stick (F8 after post again to select it as the boot device), When chameleon loads this time you need to select your freshly installed Mountain Lion hdd to boot from so select it and wait for it to load
- After Mountain Lion has booted to the desktop run the other package that you downloaded 'P8P67 Pro Driver Installer.pkg' this will install the bootloader and necessary kexts to your newly installed drive
- NOTE: This package installs NullCPUPowerManagement kext - if you use a modified mobo bios you can delete this kext and flush your cache.
- If you use a 6950 or 6970 GPU "AND" use the modified mobo bios then be sure to set graphics enabler to no and when faced with the white screen and mouse pointer just press the power button to send the hack to sleep, wait a few seconds and wake it and all *should* be good.
As always 'Good Luck all'Don't forget if you need GraphicsEnabler you will have to edit the boot.Plist because by default its set to No
------------------------------------------ UPDATED FOR 10.8 GM --------------------------------------
Latest install file for 10.8 GM is available here http://www.mediafire.com/?qdsknbsqwwvj5kz
- Follow steps 1-18 above
- At step 19 run the package that has been (hopefully) created on the root of your usb install drive. This package contains all of the kexts and the bootloader to make your new install bootable.
- If you use a 3000 series bios you are on your own - I've not tested against this bios version and you will most likely require a new DSDT.
- Once again NullCPUPowerManagement is installed by default but you can safely delete this and flush your cache if you are using a modified bios.
- I have removed the edited ATI 6900 series kexts because they wont work (or rather I couldn't get them working) with 10.8 GM. If you have an AMD/ATI 6900 series card don't waste your time.
- GraphicsEnabler is now enabled by default - feel free to disable it if you don't need it or have problems with it
- You may need to install driver package again after your first reboot to enable audio (seems to be a bug in the postinstall script that I've not managed to iron out).