Hi there, welcome to the forum.
This tutorial is more complete and precise.
From the live USB:
sudo mkdir -p /mnt/broken
sudo mount /dev/sda2 /mnt/broken
sudo garuda-chroot /mnt/broken/@
From inside the chroot:
mount /dev/sda1 /boot/efi
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=garuda --recheck
update-grub
exit
update-grub should launch the os-prober, which should find the Windows installation.
1 Like