How to Fix My Catalina suddenly lost boot

By Freirburro
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How to Fix My Catalina suddenly lost boot

This mini-guide provides a structural approach to troubleshoot and fix the issue.

Prerequisites

  • Confirm your hardware specifications (CPU, GPU, Motherboard).
  • Ensure you have a bootable recovery USB and backup your EFI.

Fix Steps

  1. Check if your GPU requires WhateverGreen or specific boot-args (e.g., agdpmod=pikera).
  2. Ensure Metal acceleration is fully supported for your macOS version.
  3. Update Lilu and WhateverGreen to the latest versions.

Verification

  • Reboot and verify if the functionality is restored and stable under typical usage.

Original Question:

Today after waked up it freeze and restart. My mobo report bios corrupt and restore. And my using Catalina disk disappeared from boot list. I boot from other disk with high Sierra, Catalina boot weren't in Clover screen. After boot in HS I still can access Catalina disk.

Should I install Clover Bootloader? And it have 2 disks MacOS and MacOS-Data what disk can install?

Thank you.

submitted by /u/jokerx86
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