I did diskutil list and saw the partition is /dev/disk0s1, so I then did sudo diskutil mountDisk disk0s1
Then in finder I tried to copy the contents of the EFI folder on my USB drive over to the EFI partition and I got the error:
The item "com.apple.recovery.boot" can't be copied because there isn't enough space.
(I've typed out the error hence the different quotation marks)
Edit: I see the problem, I tried to copy the wrong folder. It seems to be resolved now
I did
diskutil list
and saw the partition is /dev/disk0s1, so I then didsudo diskutil mountDisk disk0s1
Then in finder I tried to copy the contents of the EFI folder on my USB drive over to the EFI partition and I got the error:
The item "com.apple.recovery.boot" can't be copied because there isn't enough space.
(I've typed out the error hence the different quotation marks)
Edit: I see the problem, I tried to copy the wrong folder. It seems to be resolved now