EDIT: I had the SDD analyzed by a data restore company. They wrote that the SSD has a fatal error in its firmware / microcode (controller damage). Since it is an Apple SSD they cannot do anything about it. Do you know, if Apple itself has some measures to restore this?
ORIGINAL POST: I updated an old mid-2013/early 2014 MacBook Air (with the model identifier
MacBookAir6,2) to macOS 11.7.3. After the update the MacBook Air did not start anymore. Recovery and internet recovery did not work. I now have a bootable stick and tried to install macOS Big Sur from that. Unfortunately, I can't since neither Install, nor Disk Utility or
diskutil list show the SSD anymore. It did work before the update. Has this ever happened to anyone or does anyone have an idea how to get the MacBook Air to recognize the SSD again? Still have some important data on that drive.