MP 1,1-5,1 How to restore my cMP 3.1 to original Snow Leopard when I run on...

[BelgianBoy]

How to restore my cMP 3.1 to original Snow Leopard when it runs on Capitan now thanks to Dosdude.
I need to sell my cMP but don't want to leave all my info on it. I want to keep the startupdisc so I tried to re-install OSX on another drive but it doen't work. Any suggestions?

 

[Soba]

If you used a Dosdude patcher (you said "Capitan," but El Capitan works natively on the 3,1 so I assume you meant Catalina), then you probably cannot keep the startup disk as is. I recommend wiping all disks in the system and reinstalling OS X to a blank disk from a bootable USB installer.

Snow Leopard is not available unless you have an install DVD.

El Capitan is downloadable direct from Apple and you can make a USB installer to boot the system, wipe all disks using Disk Utility, and then cleanly install El Capitan. Read this page to download an El Capitan installer and create USB installation media:

Create a bootable installer for macOS - Apple Support

You can use a USB flash drive or other secondary volume as a startup disk from which to install the Mac operating system. These steps are primarily for system administrators and other experienced users who are familiar with entering commands in Terminal.

support.apple.com

El Capitan is the last version of OS X to run natively on the Mac Pro 3,1 so that is probably the most desirable version to install if you're selling the system. If you really want Snow Leopard, you will need to find a disc for it. For security reasons, I do not recommend downloading software off of random sites online because you never know what you're getting.

Let us know how things go with your install.

 

[BelgianBoy]

Thank you. I will follow these tips and keep you informed.

 

[BelgianBoy]

Weird. Seems to be stuck...

Mac-Pro-van-Jan-P-Wouters:~ Bibi$ sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Naamloos --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app
Password:
Ready to start.
To continue we need to erase the disk at /Volumes/Naamloos.
If you wish to continue type (Y) then press return: Y
Erasing Disk: 0%... 10%... 20%... 30%...100%...
Copying installer files to disk...

Nithing about making bootable ets.
Staying there for more than 30 minutes. I can see installed items on the usb stick.

 

[BelgianBoy]

Patience needed:
Success!

Copy complete.
Making disk bootable...
Copying boot files...
Copy complete.
Done.
Mac-Pro-van-Jan-P-Wouters:~ Bibi$

 

[BelgianBoy]

Is there any way to "anonymise" an existing system? So that one can sell without giving away personal info ? I tried to clean install but it failed. 3 tries and fails: installation took hours...

 

[Soba]

Is there any way to "anonymise" an existing system? So that one can sell without giving away personal info ? I tried to clean install but it failed. 3 tries and fails: installation took hours...

Please describe and post screenshots of the failures you are seeing.

 

[BelgianBoy]

Progress bars of installation that stop progressing.

 

[Soba]

Progress bars of installation that stop progressing.

If there is no error, then let it be until it finishes. Installation will probably take several hours or more from a USB drive and the progress bars will sometimes not move for a very long period of time.

Leave it running overnight if needed.