La instale tal y como pone en este post
http://forum.xda-developers.com/show....php?t=1928950 tenia la rom original del Neo en la version de android 4.0.4
How-To install Jelly Sandwich
1. Download ROM and place it on SD
2. Flash latest stock ROM using Flashtool (first time flashing only)
3. Go to CWM (if you don't have it, use X-Parts or flash custom kernel)
4. Clean cache.
5. Fix permissions.
6. Start ROM zip with AROMA
7. Choose "wipe data and cache"
8. When the installation ends don't reboot
9. Clean cache
10. Fix permissions
11. Reboot