Issues with my parrot upgrade from version 5.3 to version 6.1.0

Hello team. I updated my parrot os from version 5.3 to version 6.1.0. Since then my os cat boot. I’m getting white scree prompt with contact system admin.

I wish to repair the broken files rather I can downgrade my OS to 5.3 using live boot USB. Kindly can someone come to my rescue?

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