After you're done partitioning, now its time to remove files and also include our needed files.
Enable a ssh session after reboot, and then we're going to enter these commands.
Make sure you replace "bsize" with your devices blocksize
mount_hfs /dev/disk0s1s3 /mnt1
/sbin/newfs_hfs -s -v Data -J -P -b bsize -n a=bsize,c=bsize,e=bsize /dev/disk0s1s4
mount_hfs /dev/disk0s1s4 /mnt2
mv -v /mnt1/private/var/* /mnt2
rm -rf /mnt2/log/asl/SweepStore
rm -rf /mnt2/mobile/Library/PreinstalledAssets/*
rm -rf /mnt2/mobile/Library/Preferences/.GlobalPreferences.plist
rm -rf /mnt2/mobile/.forward
umount /mnt2
That's pretty much all of the removing of files, for now...
Now, we're going to remount the secondary filesystem as r/w
nano /mnt1/private/etc/fstab
Change the values to "disk0s1s3" and "disk0s1s4."
Then, remove nosuid and nodev.
Note: This will depend on your main iOS
If your main iOS is 7.1.2 or lower, follow this guide, otherwise scroll
down a bit to find another way to make sure fixkeybag gets executed.
Make sure you still use the commands above for post-iOS 9, except the
"new_hfs" part since we remove "-P" parameter.
cp -av /usr/share/dualbootstuff/fixkeybag_legacy /mnt1
mv -v /mnt1/fixkeybag_legacy /mnt1/fixkeybag
Now, to finish it off, this will also depend on what device you have.
If your device is an iPhone 4S or anything around that timeline, we need
to pack the baseband into the second os.
Note: each device has a different path for this so just replace the path with a path like: Trek, Mav, etc.
cd /usr/local/standalone/firmware/Baseband/Mav5/
mkdir -p /mnt1/usr/local/standalone/firmware/Baseband/Mav5
zip -r0 /mnt1/usr/local/standalone/firmware/Baseband/Mav5/Mav5-personalized.zip *
/sbin/newfs_hfs -s -v Data -J -b bsize -n a=bsize,c=bsize,e=bsize /dev/disk0s1s4
NoMoreSIGABRT disk0s1s4
Since for pre-iOS 8, we use launchd to "untether" or just basically make sure that fixkeybag is being executed
during the boot. If you're running any version above iOS 7.1.2, Apple has mitigated this, so we need to make it
execute from another way. Enter the commands below to fix this problem.
cp -av /usr/share/dualbootstuff/fixkeybag /mnt1
mv -v /mnt1/usr/libexec/keybagd /mnt1/usr/libexec/keybagd_bak
mv -v /mnt1/fixkeybag /mnt1/usr/libexec/keybagd
iOS 10.x has extra protections, these commands will fix that.
mv -v /mnt1/usr/libexec/keybagd /mnt1/usr/libexec/com.apple.keybagd
ldid -S /mnt1/usr/libexec/com.apple.keybagd
mv -v /mnt1/usr/libexec/com.apple.keybagd /mnt1/usr/libexec/keybagd