How to downgrade iOS12.5 to iOS 10.X on A7 devices with SHSH blobs

What will you need?

• SHSH blobs

• two iPSW files

• brain

• computer

• iphone or ipad ios11.3.1 or any other empty_list or multi_path iOS exploit

• internet

How to do that?

1. Download futurerestore

2. Create folder downgrade and put futurerestore files to it

3. Download iOS ipsw for the version you want to downgrade and for iOS 10.3.3 (from here)

4. Download BuildManifest OTA for your device from here and put it in downgrade folder

5. Rename iOS 10.3.3 ipsw file to zip and extract it

6. Search for baseband (like Mav7Mav8-7.60.00.Release.bbfw)

7. Search for sep (like sep-firmware.n53.RELEASE.im4p)

8. Put these files into downgrade folder

9. Put your SHSH blob without APNonce to downgrade folder

10. Put iOS you want to downgrade to downgrade folder

11. Install and run noncereboot1131 on you device

12. Open you shsh file and search for the generator like 0x25abbc5cee08a593

13. Put it in noncereboot1131 and apply it

14. Now do not turn off your device and open terminal

15. Type cd /path/to/your/downgrade/folder

16. And run ./futurerestore_linux -t yourshsh.shsh2 -b baseband.bbfw -p BuidManifestOTA.plist -s sepfileforyourboard.im4p -m BuidManifestOTA.plist -d ipswtodowngrade.ipsw

17. And press enter. Now your device should reboot to recovery and start restoring.

Notes:

It must be mentioned that you need ERASE (full blobs) not just OTA blobs for this to work. The versions that are fully compatible with the iOS 10.3.3 SEP are iOS 10.2-10.3.3.