Default [Q]

Hello guys
I had flashed ultimate galaxy v4 recently without hitches however after a few days it stopped working altogether and I tried flashing it again only to be met by a message "bad zip"so I went on ahead and flashed legoice fusion ROM now I can't access play store even after flashing patch also I tried playing assasinsscreed but it works only upto a certain checkpoint and it quits
I would b grateful if u guys can find a solution to the above probs
Also can I increase performance while staying on the same ROM
I tried suvi script without much difference