Sophos Central Endpoint and SEC: Computers fail/hang on boot after the Microsoft Windows April 9, 2019 update. Please follow knowledge base article 133945
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Is there a quick and easy way to downgrade firmware which i have upgraded?
there is no inbuild method to do this.
The only way you have is to reimage via CD or usb.
*ALWAYS* generate a backup image using your favorite backup software before installing updates. Downgrading is much quicker and you don't lose your logs (side effect of the method above).