TaiG has just released TaiG 8.1.2-8.x untether 2.1.2 in cydia to fix the problem of Cydia substrate which was not working after the jailbreak, for those of you who jailbroken, all you need to do is :
- run your cydia and add this source : http://apt.taig.com
- Update TaiG 8.1.2-8.x untether
- Reboot your device.... DONE !