Modifying Filesystem

One thing we always do when we dual-boot is modifying fstab and nothing changed on 64-bit devices. You still need to modify it to specify root partition and data partition (/private/var).
But before modifying anything we need to mount our second OS partition.

mount_hfs /dev/disk0s1s3 /mnt1

nano /mnt1/private/etc/fstab

We need to modify to make it look like that:

Now we need to copy SEP to our second system partition

cp -av /usr/standalone/firmware/sep* /mnt1/usr/standalone/firmware

Now we need to copy baseband to second partition.

cp -av /usr/local /mnt1/usr/local

That's all ! You can now proceed to next step.
Patching bootchain