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TL; DR: How to fix EFI partitions that accidently deleted and cause windows 7 gone from dual boot

What happend: So recently im dualbooting windows 7 with linux zorin os (based on ubuntu) and tried to reinstall linux but accidentally deleting the EFI partitions and now only linux show up on grub, i can't boot to windows

Before Accident: Windows 7 dualbooted with zorin os, when installing zorin it prompted me to make EFI partitions thinking its just for zorin

What did i do:

  • Plug linux bootable usb
  • Readding (delete and add back) Swap, Root, Home, and EFI partitions
  • Error: Can't install, Fatal Error
  • Grub Rescue Showed up
  • Boot to zorin live sessions
  • Run "Repair Boot"
  • Repair boot ask to do some command on terminal
  • Restart the device

Result: Windows Partitions is Intact but can't Boot from grub because memorytest and windows 7 is gone

Similar Issue: Reconstructing Windows EFI files in /boot partition (Linux+Windows dual boot)

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  • Try the Rescatux & Super Grub2 Disk.
    – harrymc
    Commented Jul 25, 2023 at 8:55
  • Im gonna try that later, but do you know how to fix this with "similar issue" links method that i provide? But for windows 7
    – Ricky Nolep
    Commented Jul 26, 2023 at 10:12
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    With Windows 7, I suppose that this is an old computer. Are you sure that it supports EFI?
    – harrymc
    Commented Jul 26, 2023 at 12:35
  • Yes it is an old computer but everytime I plug a bootable USB it has 2 options, normal and UEFI, I'm curious if I install Linux on non-EFI partitions will it fixed since my problem was accidentally wiped EFI partition?
    – Ricky Nolep
    Commented Aug 1, 2023 at 12:37

1 Answer 1

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The fix is actually really simple, just run sudo update-grub and grub finally be-able to detect windows boot partitions

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