Operating Systems > Tiger (Apr 2005)

installing osx tiger 10.4 on a mac shipped with Leopard (iMac/MacPro/MacBook)

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chrisNova777:
i have read that this is possible providing you use a mid-2007 imac to format/install the partition

but im curious if its also possible to do this without a mid-2007 imac (as i dont have one of these machines)

there are two updates on this page:
http://support.apple.com/kb/HT1599


--- Quote ---This update is for 20-inch and 24-inch Mid 2007 iMac computers with the ATI Radeon HD 2600 PRO graphics running Mac OS X v10.4.10 with or later iMac Software Update 1.2.1 (Tiger) or Mac OS X v10.5 with iMac Software Update 1.3 (Leopard) installed.
--- End quote ---

the 2008 imac 2.8ghz machine that i have
http://www.everymac.com/systems/apple/imac/specs/imac-core-2-duo-2.8-24-inch-aluminum-early-2008-penryn-specs.html
has this exact video card "Ati Radeon 2600 PRO"


--- Quote ---Radeon HD 2600 PRO    VRAM Type:    GDDR3
Details:    ATI Radeon HD 2600 PRO graphics processor -- using PCI Express -- with 256 MB of GDDR3 video memory
--- End quote ---

the two updates are:
iMac Graphics Firmware Update 1.0    6
iMac EFI Firmware Update 1.3

the efi firmware update:

--- Quote ---After the firmware is successfully applied to your Mac, your Boot ROM Version will be:

IM71.007A.B03

You can confirm the version of the BootROM installed on your computer using System Profiler.
--- End quote ---

is this firmware installable onto my 2008 imac.. or will it not allow me to do the update?
and if i do the update, will this enable the installation of mac os tiger (intel) from a commercial dvd?


the page goes on to explain u can restore your original firmware using a firmware restoratin cd creatable on any powerpc or intell mac

chrisNova777:
ok disregard the above..
http://tinyurl.com/pwjd6m5
visit this link

heres some instructions on how to install tiger 10.4.11 onto an intel imac that normally wont allow you to install
my victim: the early 2008 2.8ghz imac 24"
http://support.apple.com/kb/sp485
http://www.everymac.com/systems/apple/imac/specs/imac-core-2-duo-2.8-24-inch-aluminum-early-2008-penryn-specs.html


--- Quote ---SUCCESS!!
i've succeeded in installing this on my early 2008 2.8ghz imac 24"!!
let me share with you how this was accomplished as it was something i was trying to do for the last few years!
-download this onto a snow leopard or leopard mac
-convert this 10.4.4 install dvd to read/write with disk utility
-opened up /system/installation/packages folder and then right click "osInstall.pkg" and reveal "package contents"
-drag osinstall.dist file to textedit) and search for "imac4,1"and change any occurrence of "imac4,1" to match your target machine. I changed that to imac8,1 which is what my imac is.
-plug in a firewire or usb external drive reformat & REPARITION ensuring that it was in GUIID partition type (mac intel bootable requirement) if its already in GUID partition type then you dont need to reformat but reformatting is a safe way to ensure a clean filesystem
-run the installer + select the usb or firewire drive and unchecked all the extra stuff under "Customize" so it doesnt prompt u for "disc 2"
-download the combo update for 10.4.11 *intel* and run it, targetting the external drive
-go to startup preferences BOOM theres my intel 10.4.11 disk! restart + bam! TIGER on 2008 imac!!
you are now free to clone this usb drive to a partition on your imac's internal drive!!
--- End quote ---

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