Help deleting and reinstalling MacOS

There is 3 différents (Key shortcut) recovery available.

I can do anything in most recent version except Target mode.

If I try to reinstall an MacOS with the older Disk Utility ? it will probably have a hard time reading the disk

Here what I got so far, and I don't have access to the Terminal

If I boot with Option-Command-R

Open in Recovery assistant, there is no Disk Utility showing 

• Recovery assistant Menu: About R.A., Change language, Erase Mac

The assistant write " There are no Users on this volume to recover ", "Restart"

• Apple menu there is Startup disk, Restart, and Shut down.

In "Startup disk" it show "Macintosh HD macOS 26.3", I can choose it and restart and I can reboot in Target mode.

I don't have access to Terminal

If I boot with  Command-R

Open in Recovery assistant, there is no Disk Utility showing 

• Recovery assistant Menu: About R.A., Change language, Erase Mac

The assistant write " There are no Users on this volume to recover ", "Restart"

• Apple menu there is Startup disk, Restart, and Shut down.

In "Startup disk" it show "Macintosh HD macOS 26.3", I can choose it and restart and I can reboot in Target mode.

I don't have access to Terminal

If I boot with Shift+Option+Command+R

I have to authenticate with AppleID.

It bring me to Disk Utility 10.15.7 with Apple menu, File, Edit,Utility and Window.

The current Window: as Restore from Time Machine Backup, Reinstall macOS, Get online help, and Disk Utility

(sorry I booted in French)

Disk Utility:

S.O.S., Partition,  Delete,  Restore, Mount

Interne:

APPLE SSD AP4096N Media

Conteneur disk2

disk2s1

Macintosh HD - Data

Update

Images disque:

Apple disk image Media

macOS Base System

Conteneur disk2, Conteneur APFS

Update 1,4 Mo, 5 non monté  974,91 Go, Disponible 3,03 To

Number of volumes : 6

Type : Conteneur APFS

Capacity : 4 To

Physical Stockages  : disk0s2

Available : 3,03 To

Connexion : PCI-Express

Used : 974,92 Go

Device : disk2

disk2s1 Volume APFS, Not mounted

Mounting point Not mounted

Type : APFS Volume

Capacity : Zéro ko

Physical Stockages  : not active

Available : Zéro ko

Connexion : PCI-Express

Used : ---

Device : disk2s1

Macintosh HD - Data, Not mounted

Mounting point Not mounted

Type : APFS Volume

Capacity : 4 To

Physical Stockages  : Not active

Available : Zéro ko

Connexion : PCI-Express

Used : ---

Device : disk2s4

Update, Volume APFS Used 1,4 Mo Other volumes 974,91 Go, Available 3,03 To

Mounting point : /volume/Update

Type :  APFS Volume

Capacity : 4 To

Physical Stockages  : Active

Available : 3,03 To

Connexion : PCI-Express

Used : 1,4 Mo

Device : disk2s5

Apple disk image Media, Disk Image, MacOS Base system

Location : Externe

Capacity : 2,15 Go

Conexion: Disk Image

Number of child : 1

Partition Table : GUID Partition Table

Type: Disk

SMART state not use

Device : disk1

macOS Base System, Disk Image volume, MacOS extended 10.15.7

Mounting point : /

Type : Disk Image volume

Capacity : 2,01 Go

Physical Stockages  : Active

Available : 666,6 Mo

Connexion : Disk Image

Used : 1,35 Go

Device : disk1s1

----------      ----------

<There is no reason to erase the OS. It is on a read-only volume mounted from a cryptographically sealed snapshot. It cannot be modified, corrupted or any other reason to reinstall. If there is such a reason, you drive is failing.

Erase all Content and Settings is the appropriate remedy for problems you think are related the need to reinstall the OS.>

As of now, I am unable to boot into MacOS, I am lock-out

<Since you are posting on the Tahoe forum, I assume your Mac is certified to run Tahoe. In that case, it has a T2 chip and is always encrypted. If decrypting FileVault takes any time at all, you likely do have disk corruption. Since a T2 Mac is always encrypted, decrypting should be instantaneous.>

I seem short for the complete disk, It lasted a long minute.

<I reboot and when it is time to log, my password, or any other user, will work.

And I know my password by heart for many year's, and i mush have enter it 10 time in the last hour.

And than it ask me for my security key, I find it, check it twice and it won't work.

So I am left with having to delete my disk.>

Ho...no! <...my password, or any other user, ...> I mean will Not work!

<Again, sounds like some very rare corruption issue with your SSD. Likely failing.

Now the recovery partition won't let me use the Utility, I only have Boot drive and erase disk.

Please explain. What do you mean by "Boot drive?" While in Disk Utility, did you select Show All Devices from the View popup menu?>

I meanI have only 2 think available, I can select a boot drive, it for Target mode I think and Erase

<When I try erase, It will not, saying "Couldn't open device.: (-69877)".

What exactly are you trying to erase?>

My disk, so I can reinstall a backup

< I try internet boot, I see the Planet and it Take a long time to load, but it the same thing, it won't work.

Some networks and router settings make it difficult to connect to Apple's servers.>

Finally found that the Internet Boot did not fonction and the boot when back to the disk recovery

<Finally I try One of my back-up, And it telling me I am not allow.

Not allowed to do what?>

I had the message that I was not allowed to boot from the backup Disk

<I just want to erase my mac!

Based on what you have posted, that may not be possible. Do you have an Apple Store or Authorized Repair Center nearby?>

I still have a few thing to try, since I finally was able to log onto the internet recovery.

I did run SOS and it talk about "error log tells us ... Severe File System Corruption" See Jul 3, 2026 5:08 PM in response to irayspot

Here where I am. (all go fast, i am out of time for now).

The internet recovery didn't work the first time.

I succeed ultimately, now disk utility is saying Impossible de monter « Macintosh HD -

Data » (Erreur

com.apple.DiskManagement.disenter

49229.)

Here what SOS on HD -Data said:

Exécution de S.O.S. sur « Macintosh HD - Data » (disk2s4)

Repairing file system.

Volume is already unmounted.

Performing fsck_apfs -y -x /dev/rdisk2s4

Checking the container superblock.

warning: container has been mounted by APFS version 2632.80.1.0.1, which is newer than 1412.141.1

warning: disabling overallocation repairs by default; use -o to override

Checking the EFl jumpstart record.

Checking the space manager.

error: spaceman chunk disk address out of order: 0x60000000k)350000,

expected 0x350000

Space manager is invalid.

The volume /dev/rdisk2s4 could not be verified completely.

File system check exit code is 0.

Restoring the original state found as unmounted.

AI:

error log tells us exactly what went wrong and confirms two critical findings:The Version Mismatch: The log shows container has been mounted by APFS version 2632... which is newer than 1412.... This reveals you booted into an old version of Internet Recovery (likely macOS Catalina), which cannot comprehend or fix the newer file system layout from your actual macOS version.Severe File System Corruption: The line Space manager is invalid means the virtual map tracker that assigns physical storage blocks is scrambled. Despite the deceptive "exit code 0", the log states "The volume could not be verified completely".Because the space manager is structurally broken, Disk Utility cannot mount the drive.

You have two options to fix this:Option A: The Data Preservation Route (If you need your files)Do not try to erase anything yet.

Force a Newer Recovery:

Target Disk Mode:

I doubt the recovery will fonction!

Let see tomorow.

I recommend checking the following:

1. Start your Mac in macOS Recovery and open Disk Utility.
2. Choose View > Show All Devices.
3. Select the physical SSD at the top of the sidebar and try erasing the device itself, not just the APFS volume.

There is a menu flashing "File... " but it only half a second, I can't do nothing

My problem is that the recovery partition won't let me use the disk Utility, I only have Boot drive and erase disk showing. And Erase won't work.

Yesterday I was thinking I was lock-out, but now it look like a corrupted disk.

I wonder if I can boot from a external disk and repair.

I will test Target mode and try to savage.

I have backup, but it date a few mount back.

disk2s1 unmounted with Erreur com.apple.DiskManagement.disenter 49229

Macintosh HD - Data unmounted with Erreur com.apple.DiskManagement.disenter 49229

Update

MacOS Base System