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Crisis
Aug 9, 2012, 11:10 PM
I bought a new rMBP last month and received a redeem code for Mountain Lion. Now I am trying to upgrade my Late-2009 MBA, which is still running a Leopard system. However, I copied the InstallESD.dmg from the installation package to this Leopard machine and it cannot be mounted, not to say restoring it to a flash disk.

Is it because the system is to obsolete that cannot read newly released dmg files? This mba is in my another house and I didn't bring my new rMBP here. so the InstallESD.dmg and a Leopard machine is all I have here, please please give me some advice!



iVoid
Aug 9, 2012, 11:18 PM
Have you tried copying the entire "Install Mountain Lion" app to the SL machine?

Icy1007
Aug 9, 2012, 11:32 PM
I bought a new rMBP last month and received a redeem code for Mountain Lion. Now I am trying to upgrade my Late-2009 MBA, which is still running a Leopard system. However, I copied the InstallESD.dmg from the installation package to this Leopard machine and it cannot be mounted, not to say restoring it to a flash disk.

Is it because the system is to obsolete that cannot read newly released dmg files? This mba is in my another house and I didn't bring my new rMBP here. so the InstallESD.dmg and a Leopard machine is all I have here, please please give me some advice!

You can't upgrade a Mac with Leopard to Mountain Lion.

Crisis
Aug 9, 2012, 11:41 PM
Have you tried copying the entire "Install Mountain Lion" app to the SL machine?

No, clearly it cannot run on a Leopard so I copied the InstallESD.dmg inside it.

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You can't upgrade a Mac with Leopard to Mountain Lion.

I know, I guess Apple means the Install Mountain Lion app runs only on SL and Lion. That for upgrading, but what I am trying to do here is creating a bootable installation disk and wipe my HD drive and make a clean install.

VTECaddict
Aug 10, 2012, 12:14 AM
Try restoring it to a flash drive through Disk Utility without mounting it first