silikonelegant.blogg.se - How to downgrade mac os to snow leopard

#How to downgrade mac os to snow leopard mac os x
#How to downgrade mac os to snow leopard install
#How to downgrade mac os to snow leopard update
#How to downgrade mac os to snow leopard pro
#How to downgrade mac os to snow leopard software

Start your iMac in Target Disk Mode by holding down the T key on your iMac keyboard immediately after starting up.Connect the two computers together via a FireWire cable.

#How to downgrade mac os to snow leopard pro

Borrow your friend's MacBook Pro and ensure it and your iMac are both switched off.

You can use Target Disk Mode to get around your problem. Proceeding with this will reformat your hard drive - so proceed carefully and ensure you have a current backup! IMPORTANT: This solution is based on your comment that you have backups of all your files etc. The installers you're trying to use are for Snow Leopard 10.6.1 or 10.6.2.

#How to downgrade mac os to snow leopard update

It is this update that is preventing you to boot from your Snow Leopard discs because the firmware update itself requires as a minimum Snow Leopard (10.6.3). Because of your music requirements (as expressed to me via Comments), I am 99.9% certain you installed this firmware update (which Apple recommended all users do anyway). the i5 and i7 versions) had a firmware update. These were options for the 27" model only and both variants (i.e. Well, the key issue here is that your iMac is one of the quad core models.

#How to downgrade mac os to snow leopard mac os x

Now, the reason your iMac isn't booting from any of these is that it can no longer run any version of Mac OS X before Mac OS X Snow Leopard 10.6.3. It is one of these versions that will be on the original discs you refer to and, based on your lack of success with the retail copy, it is also one of these versions your friend must have as well. Pleeeeeeaaase can someone help me? Pretty please with sugar on top…!!! :)ĭepending on when you bought your iMac, it came pre-installed with either Mac OS X Snow Leopard 10.6.1 (10A2155) or 10.6.2 (10C2234). I have a function on February 19 to prepare for and I require Snow Leopard for compatibility with some specialized software/hardware. I am willing to try anything at this stage.

Searched Google, Apple discussions and here for an answer.

I did this in case there was some other issue with using the optical drive.

Followed the steps outlined at to create a bootable installation USB.

Verified that booting from the optical drive is fine (booted from a Prosoft Data Rescue II CD).

Verified the optical drive is working fine (it reads CDs/DVDs and burns DVDs fine).

Installing Snow Leopard from a retail version of Snow Leopard (borrowed from a friend).

Installing Snow Leopard from original Apple iMac grey disks that shipped with the computer.

Booting into Recovery Mode, from both the local HD and internet, but my Mac doesn't seem to support this?.

I have wasted two whole days on this and am now desperate.

#How to downgrade mac os to snow leopard install

I have the original disks (remember those things) that came with the computer but cannot install Snow Leopard. So, I decided to install Snow Leopard again.

#How to downgrade mac os to snow leopard software

This was a disaster because some of my hardware and software no longer work! Previously this iMac was running Snow Leopard 10.6.8. The plist file should be owned by root and the wheel group on Snow Leopard.I own an iMac that was recently updated in error by a family member (I've forgiven them). REMEMBER, depending on how you copy the plist file(s) you may have to change ownership of the file(s). System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/ACPI_SMC_PlatformPlugin.kext/Contents/Resources/įIND Macmini5_1.plist, Macmini5_2.plist or Macmini5_3.plist (depending on your Mac mini 2011 model, or copy all of them if you aren't sure).ĬOPY these back to the the same location on your Snow Leopard partition. USING the Lion partition (either using Finder > Go to folder…, or by using the Terminal) you need to go to: Macmini5,1 - dual core with Intel HD3000 graphicsīasically to fix this you need to modify a kernel extension, and update the caches - You need access to a copy of Lion for this - I used the copy of Lion which came preinstalled on the second hard drive. ".BUT there are serious performance issues, as Snow Leopard doesn't seem to speedstep the processor correctly with a machine identifying itself as being a Macmini5,x, so any of: What follows is an instruction I have followed (hope it helps): However there are some tweaking to do when the clone of SL is in place on the new mac (with previous Lion OS). If this tells anything about the thunderbolt function I do not know. But I do own a 27" Cinema Display which take a mini display connection (which is the same connector as thunderbolt). I have NOT tried the thunderbolt against a thunderbolt compatible screen. I have done this procedure to my own mac mini (well Duh! ) but also to a friend of mine who has the same machine but a bit slower CPU. That means that ALL macs with this CPU is the last generation to "Easily" downgrade. Yes it is true that 2011 Mac mini has a Sandy Bridge i7 CPU (2.7 GHz in my case). In regard to answers since my earlier post on downgrading 2011 Mac mini to from Lion to Snow Leopard: