Hi,
The processors are a different chip than the eMMc, which is basically another name for a SSD... It has a controller that has probably failed, and is not appearing as a result...
If the eMMC is not appearing, everything else is not going to work... You need to be able to select the OS partition on the eMMC to clone, recover, copy, or whatever...
The System Profiler has a button for Storage Devices... All of my drives show up there...
If your eMMC does not, it has failed, unfortunately..
I just noticed that in your original picture of the Notepad in Command Prompt that your OS partition is not showing... The UUI that is highlighted is not the OS partition...
It is only 3.73GB which is way too small... It must be some type of a Repair partition, but it is no longer showing either...
The fact that it is labeled UUI (C:) doesn't make it windows... The command prompt feature does not use the normal drive letter sequence that Windows does when it launches...
The OS partition would be at least 25GB...