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Big Sur bootable USB without UniBeast?

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Hello everyone,

I’m really sorry but these times I’m a bit lost, as I started planning my CustoMac before the release of Big Sur - which seems to change some things about OS installation.
I’m an IT newbie and I know that I’d probably have been more aware (in a way I got what I deserved) but your help would be much appreciated.

So I’m stuck to the bootable USB step, which I want to create from a Mavericks 10.9.5 MacBookPro 2012, and I have already built my new setup. I’d prefer to get a Big Sur on it, but Catalina would be fine. (Note that the latest versions of Opencore, for example, don’t work anymore on my macbook.)
-I got the Catalina installer (apparently full, 8.24GB) but, while following the Unibeast method, I had this “installer incomplete” message. Note that I couldn’t get the installer from the AppStore any longer, so I wildly downloaded it on the web.
-I got the Big Sur installer from the AppStore on another mac (mine was too old to get it downloaded, that was before I found out the gibMacOS trick), and here I’m a bit confused.

As Unibeast for Big Sur doesn’t seem to be developed yet, could you just refer to the proper method to create this fresh boot? What should I use, Opencore? Clover?
Does this Beta Big Sur guide also work for stable version? What about this one?

I'm a bit embarassed to stumble on this first step, for I hoped I could figure it out by myself.
Thanks in advance, and sorry for the bother…
Have a nice day !
 

Jamesbond007

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Hello everyone,

I’m really sorry but these times I’m a bit lost, as I started planning my CustoMac before the release of Big Sur - which seems to change some things about OS installation.

I’m an IT newbie and I know that I’d probably have been more aware (in a way I got what I deserved) but your help would be much appreciated.

So I’m stuck to the bootable USB step, which I want to create from a Mavericks 10.9.5 MacBookPro 2012, and I have already built my new setup. I’d prefer to get a Big Sur on it, but Catalina would be fine. (Note that the latest versions of Opencore, for example, don’t work anymore on my macbook.)

-I got the Big Sur installer from the AppStore on another mac (mine was too old to get it downloaded, that was before I found out the gibMacOS trick), and here I’m a bit confused.

As Unibeast for Big Sur doesn’t seem to be developed yet, could you just refer to the proper method to create this fresh boot? What should I use, Opencore? Clover?
Does this Beta Big Sur guide also work for stable version? What about this one?

I'm a bit embarrassed to stumble on this first step, for I hoped I could figure it out by myself.
Thanks in advance, and sorry for the bother…
Have a nice day !
The beta Big Sur guide should work with the release version, in fact the command to create the USB stick from the release version of the Big Sur installer is provided in the thread :

The OpenCore guide as indicated in your link should also work.

Note that you will most likely have to make adjustments to the USB installer in order for the Big Sur USB stick to boot on your system.
 
Joined
Apr 10, 2020
Messages
5
Motherboard
PRIME Z490-A
CPU
i5 10600K
Graphics
580
Mac
  1. MacBook Pro
Thanks for the answer. I'm gonna try that tomorrow and see how it goes.
 
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