自分でも試してみましたので、別の記事で、ちょっと解説してみようと思いますｗ 本来なら、マックのアプリストアでダウンロードした各 OS X の「インストール.app」が必要ですが、USB や DVD に作成したインストーラからも、同様の作業をすることで、作成可能ですｗ
Resolved OS X Yosemite on Unsupported Macs [Guide]
http://forums.macrumors.com/threads/os-x-yosemite-on-unsupported-macs-guide.1761432/
以下、関連情報ですｗ
この方法の対象機種（64bit MacBook）
- MacBook2,x / MacBook3,x / MacBook4,x
- MacBookPro2,x
- MacBookAir1,1
ModelProperties
MacBook2,1 MacBook "Core 2 Duo" 1.83 13"
MacBook2,1 MacBook "Core 2 Duo" 2.0 13" (White/06)
MacBook2,1 MacBook "Core 2 Duo" 2.0 13" (Black)
MacBook2,1 MacBook "Core 2 Duo" 2.0 13" (White/07)
MacBook2,1 MacBook "Core 2 Duo" 2.16 13" (White)
MacBook2,1 MacBook "Core 2 Duo" 2.16 13" (Black)
MacBook3,1 MacBook "Core 2 Duo" 2.0 13" (White-SR)
MacBook3,1 MacBook "Core 2 Duo" 2.2 13" (White-SR)
MacBook3,1 MacBook "Core 2 Duo" 2.2 13" (Black-SR)
MacBook4,1 MacBook "Core 2 Duo" 2.1 13" (White-08)
MacBook4,1 MacBook "Core 2 Duo" 2.4 13" (White-08)
MacBook4,1 MacBook "Core 2 Duo" 2.4 13" (Black-08)
MacBookPro2,1 MacBook Pro "Core 2 Duo" 2.33 17"
MacBookPro2,2 MacBook Pro "Core 2 Duo" 2.16 15"
MacBookPro2,2 MacBook Pro "Core 2 Duo" 2.33 15"
MacBookAir1,1 MacBook Air "Core 2 Duo" 1.6 13" (Original)
MacBookAir1,1 MacBook Air "Core 2 Duo" 1.8 13" (Original)
BoardIds
MacBook2,1 Mac-F4208CA9
MacBook2,1 Mac-F4208CAA
MacBook3,1 Mac-F22788C8
MacBook4,1 Mac-F22788A9
MacBookPro2,1 Mac-F42189C8
MacBookPro2,2 Mac-F42187C8
MacBookAir1,1 Mac-F42C8CC8
Proseccor / EFI / Boot
MacBook "Core 2 Duo" 1.83 13" 64 32 32
MacBook "Core 2 Duo" 2.0 13" (White/06) 64 32 32
MacBook "Core 2 Duo" 2.0 13" (Black) 64 32 32
MacBook "Core 2 Duo" 2.0 13" (White/07) 64 64 32*
MacBook "Core 2 Duo" 2.16 13" (White) 64 64 32*
MacBook "Core 2 Duo" 2.16 13" (Black) 64 64 32*
MacBook "Core 2 Duo" 2.0 13" (White-SR) 64 64 32*
MacBook "Core 2 Duo" 2.2 13" (White-SR) 64 64 32*
MacBook "Core 2 Duo" 2.2 13" (Black-SR) 64 64 32*
MacBook "Core 2 Duo" 2.1 13" (White-08) 64 64 32*
MacBook "Core 2 Duo" 2.4 13" (White-08) 64 64 32*
MacBook "Core 2 Duo" 2.4 13" (Black-08) 64 64 32*
MacBook "Core 2 Duo" 2.0 13" (Unibody) 64 64 32*
MacBook "Core 2 Duo" 2.4 13" (Unibody) 64 64 32*
MacBook "Core 2 Duo" 2.0 13" (Wh-09) 64 64 32*
MacBook "Core 2 Duo" 2.13 13" (Wh-09) 64 64 32*
MacBook "Core 2 Duo" 2.26 13" (Uni-09) 64 64 32*
MacBook "Core 2 Duo" 2.4 13" (Mid-2010) 64 64 32*
MacBook Pro "Core 2 Duo" 2.16 15" 64 32 32
MacBook Pro "Core 2 Duo" 2.33 15" 64 32 32
MacBook Pro "Core 2 Duo" 2.33 17" 64 32 32
MacBook Air "Core 2 Duo" 1.6 13" (Orig) 64 32 32
MacBook Air "Core 2 Duo" 1.6 13" (NVI) 64 64 32*
MacBook Air "Core 2 Duo" 1.86 13" (NVI) 64 64 32*