Macbook Air - Unable to Update Firmware via Apple Security Update - Machine Currently Bricked
2014 Macbook Air
I agreed to install a suggested Mac OS security update via the App Store and currently the machine is bricked - a perpetual cycle of suggested restarts after displaying a failure to update the OS/security update (whichever it is).
<> unable to update firmware <> restart and try again <>
I don't know what OS version it's trying to install as I can't examine it (or anything at all) right now; whatever update is being suggested by Apple as of today (2019-08-14).
Steps taken thus far:
1) several reboots, as suggested (and there is no other option)
2) reboot holding shift key upon start (theoretically enables safe mode; unclear if this was actually enabled or not)
This machine cannot be bricked - I need a resolution very soon.