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Cannot mount InstallESD.dmg of ML on a Leopard MBA!

Crisis

macrumors member
Original poster
Jul 19, 2012
48
41
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

macrumors 65816
Jan 9, 2007
1,134
160
Have you tried copying the entire "Install Mountain Lion" app to the SL machine?
 
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Icy1007

macrumors 65816
Feb 26, 2011
1,044
65
Cleveland, OH
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.
 
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Crisis

macrumors member
Original poster
Jul 19, 2012
48
41
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.
 
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VTECaddict

macrumors 6502
Sep 15, 2008
374
28
Try restoring it to a flash drive through Disk Utility without mounting it first
 
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