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Uodate Help needed please


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Hi all,

I have been running Catalina for around a year, no issues, all booting and running fine on my I5,  Radeon HD7900 series card, 16gb ram, Gigabyte H61m-s2pv.

I kept getting nagged with an update to 10.15.7 in Catalina and i stupidly clicked to accept,  now my system is in trouble,  it goes through the boot process,  has added an update boot to clover,  but no matter how i reboot my machine now i have a black screen once it loads up, no picture at all.

Is there a way to undo the update which i dont think has successfully completed, or is there something i can do to get my display back on so i can see whats happening?

Any input or help at this stage would be greatly accepted, please, someone will have the knowledge, i dont, i just need it up and running again before i have to go and wipe it all and start again.  Thanks in advance.



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