Factory Reset MacBook Air HighSeirra
I am trying to factory reset my MacBook Air 2014. I came across the problem that the AFPS format on Macintosh HD has a "bug" that does not allow you to reinstall MacOs HighSeirra from recover mode (command+R during boot). I learned from other forums that I need to reformat the HD to Mac OS Extended (journal). When erasing my internal drive and re entering disk utilities I am trying to re- format to the desired format, and I came across this error(see attachment). I tried to force unmount the disk drive through the terminal(diskutil diskUnmount force /...) but this was unsuccessful. Also for some reason I am able to enter the recover mode but not the internet recover mode(command+alt/option+R). Im not sure where to go from here, please help.
-Side bar:
I am not able to attach .jpeg of error message into this forum, if any one is aware of file type that is supported or another way to attach an attachment please let me know. For now I will include error message in text.
"Erasing Container disk1 and creating Preboot "\n" Erase process has failed. Click done to continue."