Could not install macOS 27.0 on the latest beta running on 15.7.9

[jamesrburgess]

Many instructions I found talk about installing an Xcode beta to get the device files. Xcode 27 is out, does that not have the right thing, why the beta?
Of course none of the Xcode 27's will run on 15 so I pulled the MobileDevice.pkg out of the bundle and installed that. VirtualBuddy now displays that macOS 27 can be installed.
The install runs for 20 mininutes but then ultimately errors out with
[01:04:36.8372] Depth:0 Code:2015 Error:Failed to restore device in recovery mode, libusbrestore error:2015
I have all the logs if any one wants to see them.

Is there anything else I should try to get macOS 27 to run?

[insidegui]

That single log line is not enough to diagnose what's happening with the installation. Please share the full logs if possible.

Unfortunately I don't have any hosts running macOS 15 that I could use to attempt to reproduce the issue :(

[jamesrburgess]

Cool, thanks for replying. I wasn't sure if there was any interest in my slightly aging host. Here are the logs
VirtualBuddy MobileDevice Logs.zip

Let me know if you'd like me try anything.
regards,
James

[insidegui]

Judging by those logs, the restore never even began because MobileDevice on your host is not doing the right thing for the macOS 27 installation, so it just gets stuck. This is odd given that you have installed the updated MobileDevice.pkg. I suggest trying a restart of the host in case something got stuck with the MobileDevice update.

Another workaround would be to install a previous version of macOS in the VM and upgrade to macOS 27 within the guest itself, as described here: #194 (comment)

[jamesrburgess]

I will give both of those a shot and report back. I did also see there was a MobileDeviceDevelopment.pkg inside Xcode 27, they seem related, should I try installing that?

[jamesrburgess]

So just a reboot fixed this issue! I'm now running 27.0 on 15.7.9 using Virtual Buddy 2.2 (417) Runs pretty well on my M1 Max MBP. The only odd thing I've seen so far is that youtube loads but won't play videos. Chrome plays them just fine so I don't really care.

My process to getting this far was to download Xcode 27.0 to my 15.7.9 machine. This macOS can't run this version of Xcode and the app icon has the stop, this isn't going to work circle with a line through it on the top of the normal icon. In the Finder, do Show Package Contents. Then in Contents/Resouces/Packages find MobileDevice.pkg, drag that out to the desktop and double-click it to install it. Reboot the machine. Go back into VirtualBuddy, now macOS 27 says it can install. Click install.

Fantastic!

[jamesrburgess]

One thing that did not work but I have investigated it yet. When I set the VM up before hitting install I chose a folder to share with the VM. That appeared not to work.

[insidegui]

Thank you for the update.

One thing that did not work but I have investigated it yet. When I set the VM up before hitting install I chose a folder to share with the VM. That appeared not to work.

Did you install the VirtualBuddyGuest app in the guest OS? It is required for mounting the shared folder automatically. There's a brief explainer in the readme about it.