I've tried all the above firmwares, but none of them supports n-gage

I've hacked the phone with helloox2, the installation of n-gage works fine, it finishes, but when I go to applications, there is no n-gage icon, or in application manager there is no n-gage installed. What may be the problem ? Has any of you managed to install n-gage on one of the above firmwares ? If yes, can you explain to me, or a step by step guide, or what version of n-gage should I install or maybe i haven't hacked the phone corectly ? If not, how can i go back to the original firmware ? I cannot find it anywhere; i had I8510XXHJ4 and it worked fine, the only issue was the battery life, but i am willing to go back to it only for the n-gage. What may be the cause ? please give me some advice.