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have since rectified the issue.You need to mount the hard disk and the data hard disk in disk utility from recovery mode.And attach an external SSD.Creating a backup:Open terminal in recovery and type ditto "/Volumes/<Macintosh HD>/users/<your username>" "/Volumes/<External Disk>/<a folder name>", replacing <Macintosh HD> & <External Disk> with the names of them in the disk utility, <your username> with the name of your user folder, and <a folder name> with the name of a folder that exists on the external disk. This folder can be created by typing into the terminal:cd "/Volumes/<external disk>"mkdir <folder name>Then you need to typeditto "/Volumes/<Macintosh HD>/Library/Extensions" "/Volumes/<External Disk>/<another folder name>"rm -rf "/Volumes/<Macintosh HD>/Library/Extensions"cd "/Volumes/<Macintosh HD>/Library/"mkdir ExtensionsAs by removing (but first backing up) kernal extensions, you can use the Mac again.You will enter your login password, it will hang for a few moments then proceed to going back to the software update.Hope this helps everyone!