Windows can't access UEFI after converting to BIOS and Disk gets Invalid

  • Thread starter Thread starter damn daffodil
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damn daffodil

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Summarized - I was trying to install Windows 24H2 on my old Acer Aspire V5-571P, which previously installed Windows 11 23H2 smoothly. However, I'm now encountering "operating system not found" errors. I've tried using Ventoy to create a bootable USB, changing BIOS settings from UEFI to Legacy, and enabling various options, but nothing works. I can't access BIOS and all repair options fail. Command prompt shows my disk 0 as invalid and dynamic. My next step is to install Ubuntu and then dual boot with Windows 11. Any help would be appreciated.Complete - I attempted to install Windows 24H2 on my

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