OH, brother.
A class action suit for a 2011 computer that has a failed OS upgrade?
Good luck!
If the OS install failed, go back to the previous version of the OS that you were using.
Then restore from your backup.
If the internal drive failed, get a USB3 external drive (hard drive or SSD), plug it in, and set it up to become your external booter.
The Mac will still boot and run, even if the internal drive no longer is good.
A class action suit for a 2011 computer that has a failed OS upgrade?
Good luck!
If the OS install failed, go back to the previous version of the OS that you were using.
Then restore from your backup.
If the internal drive failed, get a USB3 external drive (hard drive or SSD), plug it in, and set it up to become your external booter.
The Mac will still boot and run, even if the internal drive no longer is good.