MacBook Pro not booting up - stuck on updating screen
I recently started trying to get my MacBook Pro (13 inch, late 2011) all up to date after neglecting it for a few years. I asked for advice on how to update it and followed the advice I was given. I then restarted the computer which opened to the white updating screen (with Apple logo and progress bar). It all seemed normal until the bar reached halfway and the computer crashed. I tried just turning it on and letting it load many more times but every time when the bar reaches halfway, the computer crashes. I looked up online tutorials for help and followed everything they said and even tried to factory reset from the Mac OS recovery page and it wouldn’t even let me do that (could not unmount disk).
If anyone could help it would be massively appreciated. I am in no way an expert at any of this (as I’m sure you can tell).
Many thanks