If coming from ics or jb,
1. Flash to stock. (I flashed to 2.3.5 with boot loaders) *
2. Flash corn kernel. (I rooted my phone using it) *
3. install cognition using corn kernel.
4. recovery will reboot then install cognition again.
* use 4-2ndtwin's Helpful I897 Links from the above comment to find any tool you need.