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Donc High Sierra. Est-ce que tu as de ton côté un installateur de High Sierra (6 Go) qui permettra de lancer une réinstallation après effacement du HDD ?
	
		
			
		
		
	
				
			diskutil cs list
	CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group D4BDDF13-1C0C-4A52-AB48-9D91F0974578
    =========================================================
    Name:         Macintosh HD
    Status:       Online
    Size:         499248103424 B (499.2 GB)
    Free Space:   8486912 B (8.5 MB)
    |
    +-< Physical Volume BCC9D26D-2DBA-4E4B-B8E2-4A5AFB3E8CE0
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk3s2
    |   Status:   Online
    |   Size:     499248103424 B (499.2 GB)
    |
    +-> Logical Volume Family 1462362E-8101-4C01-88E9-482A7B71FF8F
        ----------------------------------------------------------
        Encryption Type:         None
        |
        +-> Logical Volume 68567AA4-1D0A-4680-AB35-5CCB485226F1
            ---------------------------------------------------
            Disk:                  disk4
            Status:                Online
            Size (Total):          498887294976 B (498.9 GB)
            Revertible:            Yes (no decryption required)
            LV Name:               OS X Base System
            Volume Name:           OS X Base System
            Content Hint:          Apple_HFS
	diskutil coreStorage deleteLVG D4BDDF13-1C0C-4A52-AB48-9D91F0974578
	diskutil list
	/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            999.3 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     Apple_partition_scheme                        +24.3 MB    disk1
   1:        Apple_partition_map                         32.3 KB    disk1s1
   2:                  Apple_HFS Flash Player            24.2 MB    disk1s2
/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk3
   1:                        EFI EFI                     209.7 MB   disk3s1
   2:                  Apple_HFS Untitled                499.2 GB   disk3s2
/dev/disk5 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     Apple_partition_scheme                        +24.3 MB    disk5
   1:        Apple_partition_map                         32.3 KB    disk5s1
   2:                  Apple_HFS Flash Player            24.2 MB    disk5s2
	/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk3
   1:                        EFI EFI                     209.7 MB   disk3s1
   2:                  Apple_HFS Untitled                499.2 GB   disk3s2
	diskutil rename disk3s2 "Macintosh HDD"
	- à la fin de l'installation > il va y avoir la série de panneaux de paramétrage du Mac (Pays etc.) > puis à la fin de création d'un 1er compte Admin. Tu penses pouvoir le faire à la place de ta sœur ?