seprmvr64

dual-boot iOS 11.4.1-15.x with latest SEP.

What is this?

This is a tool that will patch the kernel to make the latest SEP "compatible" with lower versions, all SEP related things like passcode, TouchID, FaceID, etc. are broken, and there are other caveats, read below. This is a proof of concept, and I'm sure a lot of these patches are unnecessary, but I'm just publishing what I used to get it working.

Warning

I am not responsible for any damage caused to anything, use at your own risk, this is not meant to be end-user friendly, and I'm not going to provide support for this.

Caveats

• Does NOT work on 16 GB devices, because we are dual-booting iOS, and 2 iOS installations take up around 16 GB of space, which makes both iOS installations impossible to use.
• Encrypted WiFi networks will always say "incorrect password" when trying to connect, use a open network.
• TouchID / Passcode / FaceID are all broken, you can't use them.
• You have a NULL passcode, every time you're asked for a passcode, any input should be accepted.
• First boot ( the one with progress bar ) can take upto 1 hour on some versions, subsequent boots are normal.
• For some reason, your mainOS has a VERY high chance of bootlooping, please only use this on a test device you're comfortable losing data off.

Guide

1. Begin with downloading a IPSW for your desired iOS version, and extract it.

2. Run asr -source "ipsw/$(/usr/bin/plutil -extract "BuildIdentities".0."Manifest"."OS"."Info"."Path" xml1 -o - ipsw/BuildManifest.plist | grep '<string>' |cut -d\> -f2 |cut -d\< -f1 | head -1)" -target out.dmg --embed -erase -noprompt --chunkchecksum --puppetstrings to create a asr image.

3. Clone sshrd_script and boot into the SSH ramdisk, make sure you create the ssh ramdisk with 14.3.

4. Run /usr/bin/mount_filesystems in the SSH ramdisk to mount the filesystems.

5. Create new partitions for dual-booted iOS:

   • /sbin/newfs_apfs -o role=i -A -v SystemX /dev/disk0s1
   • /sbin/newfs_apfs -o role=0 -A -v DataX /dev/disk0s1

6. Mount the new partitions, you may need to replace disk0s1s8 and disk0s1s9 if you don't have a baseband partition:

   • /sbin/mount_apfs /dev/disk0s1s8 /mnt8/
   • /sbin/mount_apfs /dev/disk0s1s9 /mnt9/

7. Copy the keybags: cp -av /mnt2/keybags /mnt9/

8. On your mac, in another terminal, SCP over the asr image you created earlier: scp -P2222 -r out.dmg root@localhost:/mnt8/

9. Reboot your device

   • /usr/sbin/nvram auto-boot=false
   • /sbin/reboot

10. Boot into the SSH ramdisk again, and run /System/Library/Filesystems/apfs.fs/apfs_invert -d /dev/disk0s1 -s 8 -n out.dmg to apply the asr image to the new partition.

11. Mount the filesystems again:

    • /usr/bin/mount_filesystems
    • /sbin/mount_apfs /dev/disk0s1s8 /mnt8/
    • /sbin/mount_apfs /dev/disk0s1s9 /mnt9/

12. Move over /var from the rootfs partition to the var partition: mv -v /mnt8/private/var/* /mnt9/

13. Copy over preboot: cp -av /mnt6/$(cat /mnt6/active)/* /mnt8/

14. Create some folders required for booting:

    • mkdir -p /mnt8/private/xarts
    • mkdir -p /mnt8/private/preboot

15. Remove AOP firmware: rm -v /mnt8/usr/standalone/firmware/FUD/AOP.img4

16. Copy over preboot again: cp -av /mnt6/* /mnt8/private/preboot/

17. Replace the factorydata with the factorydata from the main OS:

    • rm -rv /mnt8/System/Library/Caches/com.apple.factorydata
    • /sbin/mount_apfs /dev/disk0s1s5 /mnt5/
    • cp -av /mnt5/FactoryData/* /mnt8/

18. Change fstab to point to the new partition, and change hfs to apfs: nano /mnt8/etc/fstab

19. We're almost done installing! At this point, you'll boot into the Setup screen and are unable to activate, to get SpringBoard you'll need a way to skip Setup, I won't be linking to any of these methods, so figure it out yourself.

20. Finally, reboot:

    • /usr/sbin/nvram auto-boot=false
    • /sbin/reboot

Boot files

1. Extract your IM4M file from your shsh blob using img4tool -e -s blob -m IM4M
2. Create a img4 from your trustcache and devicetree using:
   • img4 -i trustcache -o trustcache.img4 -M IM4M -T rtsc
   • img4 -i devicetree -o devicetree.img4 -M IM4M -T rdtr
3. Decrypt your iBSS and iBEC using gaster decrypt iBSS.im4p iBSS.dec and gaster decrypt iBEC.im4p iBEC.dec
4. Patch your iBSS using iBoot64Patcher iBSS.dec iBSS.patched
5. Patch your iBEC, change the rd= argument to point to your new partition, and you can replace serial=3 with -v if you don't have a serial cable: iBoot64Patcher iBEC.dec iBEC.patched -b "rd=disk0s1s8 debug=0x2014e wdt=-1 serial=3"
6. Create img4s from your patched iBSS and iBEC using:
   • img4 -i iBSS.patched -o iBSS.img4 -M IM4M -A -T ibss
   • img4 -i iBEC.patched -o iBEC.img4 -M IM4M -A -T ibec
7. Extract your kernelcache using img4 -i kernelcache -o kcache.raw
8. Now, use seprmvr64:
   • gcc seprmvr64/seprmvr64.c -o seprmvr64
   • ./seprmvr64 kcache.raw kcache.patched
9. Create a kc.bpatch using kerneldiff kcache.raw kcache.patched kc.bpatch
10. Create a img4 from your kernelcache using img4 -i kernelcache -o kernelcache.img4 -M IM4M -T rkrn -P kc.bpatch

Booting

1. Use gaster to pwn your device:
   • gaster pwn
   • gaster reset
2. Send over your iBSS and iBEC using irecovery -f iBSS.img4 and irecovery -f iBEC.img4
3. Send over your devicetree using irecovery -f devicetree.img4, then use irecovery -c devicetree to load it.
4. If you have a trustcache, send it over using irecovery -f trustcache.img4, then use irecovery -c firmware to load it.
5. Finally, send over your kernelcache using irecovery -f kernelcache.img4, then use irecovery -c bootx to boot, reminder that first boot with progress bar can take upto 1 hour, so be patient.

Scripts

I've provided some scripts in the scripts folder to help automate the booting and development process.

Credits

• Ralph0045 for the AMFI patch and base of Kernel64Patcher