## Rescue a borked Grub in Arch
### Boot arch install usb
- list devices with `lsblk` 
### mount root drive 
- if LUKS:
    - `cryptsetup luksOpen /dev/sda2 myEncryptedVolume`
    - `mount /dev/mapper/myEncryptedVolume /mnt`
- if BTRFS:
    - `mount -o subvol=@ /dev/sda2 /mnt`
- if LUKS+BTRFS: 
    - `mount -o subvol=@ /dev/mapper/myEncryptedVolume /mnt`
- if vanilla:
      - `mount /dev/sda2 /mnt`

### mount boot drive
- `mount /dev/sda1 /mnt/boot`

### Chroot and re-install grub
```bash
# chroot to the root partition
arch-chroot /mnt
# reinstall grub
grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=GRUB
# generate new grub config
grub-mkconfig -o /boot/grub/grub.cfg
```