Can't remove bootcamp partition (Error: -69879: Couldn't open disk)

Loner T wrote:

If you run BC Assistant -> Continue -> Remove/restore , are you able to remove the partition?

Nope.

That was the first thing I tried.

It just freezes in this state and nothing happens. I tried rebooting, didn't help.

Sure! here it is:

(base) timsoulo@Tims-MBP ~ % diskutil list

/dev/disk0 (internal, physical):

  #:            TYPE NAME          SIZE    IDENTIFIER

  0:   GUID_partition_scheme            *2.0 TB   disk0

  1:            EFI ⁨EFI⁩           314.6 MB  disk0s1

  2:         Apple_APFS ⁨Container disk1⁩     1.9 TB   disk0s2

  3:    Microsoft Basic Data ⁨BOOTCAMP⁩        149.8 GB  disk0s3

/dev/disk1 (synthesized):

  #:            TYPE NAME          SIZE    IDENTIFIER

  0:   APFS Container Scheme -           +1.9 TB   disk1

                 Physical Store disk0s2

  1:        APFS Volume ⁨Macintosh HD⁩      14.9 GB  disk1s1

  2:       APFS Snapshot ⁨com.apple.os.update-...⁩ 14.9 GB  disk1s1s1

  3:        APFS Volume ⁨Macintosh HD - Data⁩   453.3 GB  disk1s2

  4:        APFS Volume ⁨Preboot⁩         285.7 MB  disk1s3

  5:        APFS Volume ⁨Recovery⁩        655.5 MB  disk1s4

  6:        APFS Volume ⁨VM⁩           2.1 GB   disk1s5

Last login: Thu Nov 26 18:54:56 on console
(base) timsoulo@Tims-MBP ~ % diskutil eraseVolume free free disk0s3
Started erase on disk0s3 (BOOTCAMP)
Unmounting disk
Finished erase on disk0

+

(base) timsoulo@Tims-MBP ~ % diskutil apfs ResizeContainer disk1 0g
Started APFS operation
Aligning grow delta to 149,795,688,448 bytes and targeting a new physical store size of 2,000,796,545,024 bytes
Determined the maximum size for the targeted physical store of this APFS Container to be 2,000,795,516,928 bytes
Resizing APFS Container designated by APFS Container Reference disk1
The specific APFS Physical Store being resized is disk0s2
Verifying storage system
Using live mode
Performing fsck_apfs -n -x -l /dev/disk0s2

Checking the APFS volume superblock
The volume Macintosh HD was formatted by storagekitd (1677.50.1) and last modified by apfs_kext (1677.50.1)

Checking snapshot 1 of 1 (com.apple.os.update-779BDF1556C6F688504E24FB29C75AFFABFCB91E701806FFFF35235E19914F1E)

Checking the APFS volume superblock
The volume Macintosh HD - Data was formatted by asr (1412.61.1) and last modified by apfs_kext (1677.50.1)

Checking the APFS volume superblock
The volume Preboot was formatted by asr (1412.61.1) and last modified by apfs_kext (1677.50.1)

Checking the APFS volume superblock
The volume Recovery was formatted by asr (1412.61.1) and last modified by apfs_kext (1677.50.1)

Checking the APFS volume superblock
The volume VM was formatted by apfs_boot_util (1677.50.1) and last modified by apfs_kext (1677.50.1)

Checking the APFS volume superblock
The volume Update was formatted by com.apple.Mobile (1677.50.1) and last modified by apfs_kext (1677.50.1)

Verifying allocated space
The volume /dev/disk0s2 appears to be OK
Storage system check exit code is 0
Growing APFS Physical Store disk0s2 from 1,851,000,856,576 to 2,000,796,545,024 bytes
Modifying partition map
Growing APFS data structures
Finished APFS operation

Looks like this worked and I no longer see the BOOTCAMP partition in my Disk Utility tool!

HUGE THANKS for your help! :)