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If i'm on macOS Sequoia 15.1 dev beta, can I get macOS Sequoia 15 stable ?

GuillaumeB

GuillaumeB

macrumors 6502
Original poster
Jul 4, 2007
483
34
Just behind you
Hello,

Those past few weeks i have been playing around with macOS Sequoia 15.1 dev beta.
i'd like to start afresh next week with the stable version of macOS Sequoia 15

When turning off beta release
- Will I get macOS Sequoia 15 stable release ?
- Or will I have to wait until the stable version of macOS Sequoia 15.1 ?

Thank you
 
GuillaumeB said:
Hello,

Those past few weeks i have been playing around with macOS Sequoia 15.1 dev beta.
i'd like to start afresh next week with the stable version of macOS Sequoia 15

When turning off beta release
- Will I get macOS Sequoia 15 stable release ?
- Or will I have to wait until the stable version of macOS Sequoia 15.1 ?

Thank you
Click to expand...
You'd either need to erase your disk and install 15.0 clean or just stay on the 15.1 betas until that's released.
 
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GuillaumeB said:
When turning off beta release
- Will I get macOS Sequoia 15 stable release ?
- Or will I have to wait until the stable version of macOS Sequoia 15.1 ?
Click to expand...
It is unusual to have two versions in beta (so nothing is certain), but my expectation is that after turning off beta releases in System Settings, you will next be offered 15.1 release version. 15.0 would be a downgrade which usually requires a clean install and data recovery from a backup made with a 15.0 beta or 14.x.
 
Thanks, that's what I thought, but since it's unusual i was wondering if Apple communicated on a Stable 15 release to 15.1 testers
 
GuillaumeB said:
Thanks, that's what I thought, but since it's unusual i was wondering if Apple communicated on a Stable 15 release to 15.1 testers
Click to expand...

I wanted to downgrade too without a clean install, but found no way to do it. I didn't try using a the firmware file from another Mac yet...

I always thought you could just downgrade by installing an older version over the newer one, without getting a downgrade error message, at least the main version has to be the same and the Mac is compatible.

Either this has changed or I confused something. Maybe it only works between double-point releases, what are mostly gone since 10.15.x, but would be the same now.
 
Adora said:
I wanted to downgrade too without a clean install, but found no way to do it. I didn't try using a the firmware file from another Mac yet...

I always thought you could just downgrade by installing an older version over the newer one, without getting a downgrade error message, at least the main version has to be the same and the Mac is compatible.

Either this has changed or I confused something. Maybe it only works between double-point releases, what are mostly gone since 10.15.x, but would be the same now.
Click to expand...

Since the advent of split volume (SSV and Data) downgrading has to be done using a bootable installer of the macOS you want to downgrade to.

You have to erase the volume pair of the latest OS that you are downgrading from.

Then install the older macOS that you want, from the bootable installer.

This will give you a factory fresh install of the older macOS. If you want to migrate all your data and settings from a TM or CCC backup of the newer macOS, you can do this during Setup Assistant when it asks if you want to migrate from another Mac a backup etc.

Choose the backup you want to migrate from.

You will get a warning that the backup was made on a newer OS and recommending you update to the newer OS before migrating.

But there is an option to SKIP. This has always worked for me.

The most likely problem is that your Photos Library may have been converted by the newer OS and be incompatible with the older. If this happens you can either download a fresh copy from iCloud or repair it, which will restore compatibility. This does not happen between 15.0 and 15.1.
 
Adora said:
I always thought you could just downgrade by installing an older version over the newer one, without getting a downgrade error message, at least the main version has to be the same and the Mac is compatible.
Click to expand...
That has never worked with macOS. Also, using the firmware (IPSW) file only erases the disk. It’s not like an iPhone where you can use an IPSW file to update the existing OS without losing data. (You also can’t downgrade iOS that way either.)
 
GuillaumeB said:
Hello,

Those past few weeks i have been playing around with macOS Sequoia 15.1 dev beta.
i'd like to start afresh next week with the stable version of macOS Sequoia 15

When turning off beta release
- Will I get macOS Sequoia 15 stable release ?
- Or will I have to wait until the stable version of macOS Sequoia 15.1 ?

Thank you
Click to expand...
Like everyone has said, you will need to do a complete wipe and drive format in order to downgrade. However, if you do that now you would be going with macOS 14 until macOS 15 is released.

If you are having issues with 15.1, you might wait as this coming week there should be new updates for the OS, Beta 4. It might include some of the newer AI stuff that has not yet appeared as well as improvements to the OS
 
socialwill said:
Like everyone has said, you will need to do a complete wipe and drive format in order to downgrade. However, if you do that now you would be going with macOS 14 until macOS 15 is released.
Click to expand...


Not if he makes a bootable installer of 15.0.

It is safer and only necessary to delete the volume pair in Disk Utility. I did a complete erase of the whole internal drive once and had to use Apple Configurator to put the firmware back on.
 
Last edited:
You are right. Although I boot with the USB the system doesn't permit install over HD Machintosh with 15.1 beta
I thought previously it was permit while the system is signing, as 15.0 in this moment. But not
 
alfon_sico said:
Although I boot with the USB the system doesn't permit install over HD Machintosh with 15.1 beta
I thought previously it was permit while the system is signing, as 15.0 in this moment
Click to expand...
Logically, what you want is not possible to implement because an old version of macOS (15.0 in this case) doesn't know about changes that a newer version (15.1) has made to the read/write boot volume and so can't undo those changes. The past doesn't know about the future.
 
yesterday I start the process for downgrade from 15.4 beta to 15.3.1
Although I have a bootable usb with 15.3.1 and i have decided to format my primary ssd, i found that i haven’t any choose to format the ssd after boot with the usb installer
Once I boot and start the process it showed me the advice that i was not able to install over a previous system, nor rare, however I didnt found the usual Terminal window to format the ssd or the process let me do it in any way

I remember that it could be done in previously macos versions. I have a M2 mac mini, not intel

if I boot with recovery mode from primary partition it shows me the regular menus and I could try to format first from there. is it the way?
 
alfon_sico said:
yesterday I start the process for downgrade from 15.4 beta to 15.3.1
Although I have a bootable usb with 15.3.1 and i have decided to format my primary ssd, i found that i haven’t any choose to format the ssd after boot with the usb installer
Once I boot and start the process it showed me the advice that i was not able to install over a previous system, nor rare, however I didnt found the usual Terminal window to format the ssd or the process let me do it in any way

I remember that it could be done in previously macos versions. I have a M2 mac mini, not intel

if I boot with recovery mode from primary partition it shows me the regular menus and I could try to format first from there. is it the way?
Click to expand...
You have to roll back by booting from a bootable 15.3.1 USB installer. First use DU on the USB installer to erase the 15.4 volume pair then create a new volume. Then quit DU and run the 15.3.1 installer onto the new volume. When Setup Assistant starts at the end of the install chose to migrate from a backup. If the backup was made with 15.4 it will recommend that you update the OS before migration, but gives the option to skip, and it will migrate.

EDIT I see I wrote a longer version of this in post #7 above.
 
Last edited:
Yestaerday I can’t find DU from USB booting, neither terminal. It shows me two partition, the primar y esa unable and usb booting one
 
alfon_sico said:
Yestaerday I can’t find DU from USB booting, neither terminal. It shows me two partition, the primar y esa unable and usb booting one
Click to expand...
OK, so then select the USB installer from those two and it will boot to the USB Installer.

The interface when booted from a USB installer is exactly the same as booted from Recovery. Disk Utility is the bottom option in the main window, and Terminal is under Utilities in the menubar.



IMG_1059.png
 
I share with you the screen but it's not the same as Recovery. This is what it was before but today it is not
IMG_7034.jpeg

IMG_7035.jpeg
 
Mike Boreham said:
As I said, select the Bootable installer (in the middl)e and press continue. It will boot to the installer and you will see the screen like in Recovery.
Click to expand...
I will try but I guess it not an intuitive mode to launch a boot installer. It should work choosing the ssd that I need to format and launching the DU to work on it
 
alfon_sico said:
I will try but I guess it not an intuitive mode to launch a boot installer. It should work choosing the ssd that I need to format and launching the DU to work on it
Click to expand...

The bootable installer will be like a Recovery Partition, you have Disk Utility there and will be able to format your drive.

You just need to choose "Install macOS Sequoia" to boot from.
 
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