PLEASE HELP

[MacBook Air1111]

I tried to factory’s reset by erasing all data in “Macintosh HD” then I tried to reinstall Mac OS but OS X Base System is a locked disk. And the only disks in my disk utility are APPLE SSD a few numbers and letters then Media and OS X base system! I don’t know what to do

 

[Audit13]

Did you try doing a internet restore? Do you have a USB key with the macOS installer?

 

[posguy99]

I tried to factory’s reset by erasing all data in “Macintosh HD” then I tried to reinstall Mac OS but OS X Base System is a locked disk. And the only disks in my disk utility are APPLE SSD a few numbers and letters then Media and OS X base system! I don’t know what to do

It should be a locked disk. You don't want to install over the installer image, you want to install on the SSD.

If you didn't know what you were doing, you shouldn't have started.

 

[dangerfish]

Internet recovery if nothing my else.

 

[madrich]

Take it to an Apple Genius in the store.

 

[kohlson]

With the system connected to the internet, restart (or power up) and hold the Cmd+r key immediately after the chime. https://support.apple.com/en-us/HT201255

 

[filmbuff]

I had this problem recently and had to try several times to wipe and reformat the disk using disk utility, and finally was able to use internet recovery to download and install a new copy of Mountain Lion (the original OS) and then upgrade back to Sierra. What a pain. Plan C was to boot from a Ubuntu flash drive and use the Ubuntu disk utility to unmount and erase Macintosh SSD. The whole problem happened because I tried to restore my computer without disabling Filevault first. It should have worked fine since I had the disk password but something went awry.

 

[meeebee]

Try the Cmd+R first. If that doesn't work then create a USB installer if you can get access to another Mac (link is for El Capitan - do a search if you are looking for another version).