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start up disc error

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    MacBook Pro 13" Startup disc error after update! Help?

    Hi all, So I updated to OS Big Sur on my 2015 (I believe) MacBook Pro 13" last night all downloaded ok. Restarted to install, got right to the end and comes up with a start up disc error. Won't let me do anything and the harddrive isn't displayed on the screen. Tried booting it into recovery...
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