Accidentally wiped internal ssd error 69877

The old macOS partition seems to have been completely deleted since it is only showing up as "(free space)". The "(free space)" means there is no partition there for that 245.1GB. You will likely need to click on the Partition tab to add a new partition. Disk Utility is not a very good app, so I'm not sure whether it will be able to recreate the missing partition. If Disk Utility cannot do it, then let us know since we can probably give you an option using the command line, but you will need to repost the photo so it is properly rotated for easier viewing (I would have provide those instructions here if the photo had been oriented correctly).

FYI, you can easily rotate pictures on an iPhone/iPad by using the instructions in the following Apple article (I'm sure Android devices have something similar):

Edit photos and videos on iPhone - Apple Support

Whatever you do, do not touch those other two partitions/Containers because they are required for accessing the Startup Options menu. If anything happens to those two partitions/Containers, then you will need to perform a DFU firmware Restore which requires access to another Mac.

Hi,

Your internal drive is used by process 0, init, so you can't unmount the internal drive.

If you have external drive, install macOS on it , then select it's as startup drive with Recovery mode.

Startup from external drive then reformat internal drive with DiskUtility.

Then install macOS on internal drive and select internal drive as startup drive.

It could work, good luck.

It appears to me that you have wiped the drive and formatted it with APFS, but there are no APFS volumes created.

Have you attempted to create a Macintosh volume on that drive? Without a volume, there is no place to install the OS.

Add, delete, or erase APFS volumes in Disk Utility on Mac - Apple Support

So you tried using the Partition tab of the Disk Utility GUI and were not able to add a new partition to the empty area shown as "(free space)" in your photo?

If so, then use the following command to create a new partition/APFS Container using the Terminal command line (just make sure the device identifiers are still shown exactly the same when you go to perform this command since they can change everytime you boot). This is a three step process where you must first add a new partition with a MacOS Extended (Journaled) file system after the "disk0s1", then convert it to an APFS file system. I have tried this on a DMG. In between the two major steps you must list the drive layout again in order to get the new device identifier for the newly created HFS+ "Macintosh HD" volume.....replace "diskXsY" with the correct device identifier for "Macintosh HD" (most likely will be disk0s3).

diskutil  addPartition disk0s1  jhfs+  "Macintosh HD"  0

diskutil  list  internal

diskutil  ap  convert  diskXsY

You should now see "Macintosh HD" showing as an APFS volume with an APFS Container at diskXsY (most likely disk0s3).

Might the Disk be ecrypted?

Or see this cure...

Error -69877: Couldn't Open Disk - Apple Community

To cut down on discussion waste, why not schedule Apple in-store repair? Diagnosis and repair estimate is free, no obligation to accept. Good luck!

You're welcome. And thanks for following up to confirm the solution so that it may help others who read your thread here.

Enjoy.