Reinstall grub + BIOS + fully encrypted LUKS partitions, will this work?

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in case you need to chroot

sudo su

cryptsetup luksOpen /dev/sdaX crypto ( here volume mapper encrypted )
cryptsetup luksOpen /dev/sdaY swap ( case out encrypted )

mount /dev/mapper/crypto  /mnt
mount /dev/sda1 /mnt/boot/efi ( if you need Efi )

mount -t proc proc /mnt/proc
mount -t sysfs sys /mnt/sys
mount -o bind /dev /mnt/dev
mount -t devpts pts /mnt/dev/pts/

chroot /mnt
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