so i followed these steps:
Boot from LiveCD
btrfs-convert /dev/sda1
mount /dev/sda1 /mnt
mount -t proc none /mnt/proc
mount -t sysfs none /mnt/sys
mount -o bind /dev /mnt/dev
mount -o bind /dev/pts /mnt/dev/pts
cp -L /etc/resolv.conf /mnt/etc
chroot /mnt bash
mkdir /run/shm
ls -l
btrfs subvolume delete /ext2_saved
mc -e /etc/fstab
grub2-install /dev/sda
grub2-mkconfig -o /boot/grub2/grub.cfg
mkinitrd
Credits: youtu.be/wso_gZwr9oQ
but i skipped the btrfs delete ext2 because i didnt wanna delete anything and when i wanted to do grub-install it said there is no efi dir so please someone help as fast as possible