How to Reconstruct EFI File to Make Windows 7 Reappear on GRUB

Have you recently installed Linux alongside Windows 7 and now you can't find Windows 7 in the GRUB boot menu? Don't worry, you can easily fix this issue by reconstructing the EFI file. In this guide, we will walk you through the steps to make Windows 7 reappear on the GRUB boot menu.

Note: This guide assumes that you have already installed Linux (such as Ubuntu) alongside Windows 7 using the EFI boot method. If you have installed Linux using the legacy BIOS boot method, this guide may not be applicable.

Step 1: Boot into Linux

Start your computer and boot into your Linux distribution. Once you are logged in, open a terminal window. You can usually find the terminal application in the Applications or System Tools menu.

Step 2: Mount the EFI Partition

In the terminal, type the following command to identify the EFI partition:

Look for a partition labeled "EFI System." Note down the device name (e.g., /dev/sda1) of the EFI partition.

Next, create a mount point for the EFI partition by running the following command:

Mount the EFI partition using the following command, replacing /dev/sda1 with the device name of your EFI partition:

Step 3: Reconstruct the EFI File

Now that the EFI partition is mounted, navigate to the EFI directory by running the following command:

Inside the EFI directory, you should see a folder named after your Linux distribution (e.g., ubuntu). Change to that directory by running the following command, replacing ubuntu with the name of your Linux distribution:

Now, create a new directory called Microsoft by running the following command:

Change to the newly created Microsoft directory by running the following command:

Finally, copy the EFI file from the Windows 7 partition to the current directory using the following command, replacing /dev/sda2 with the device name of your Windows 7 partition:

Step 4: Update GRUB

Now that the EFI file has been reconstructed, you need to update the GRUB boot menu to include Windows 7. In the terminal, run the following command:

This command will scan your system for installed operating systems and update the GRUB configuration accordingly.

Step 5: Reboot Your Computer

After updating GRUB, you can now reboot your computer. When the computer restarts, you should see Windows 7 listed in the GRUB boot menu alongside your Linux distribution. Select Windows 7 to boot into it.

Congratulations! You have successfully reconstructed the EFI file to make Windows 7 reappear on the GRUB boot menu.

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