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I just tried to install another rom on my device Vsun V9 (mt6572), but it went ito a boot loop, this is not the problem, the problem is that after restoring a backup using cwm for my original rom, it is appear that when I turn on the device first a logo of the unsuccessful rom is showed up for a 3 or 4 seconds then my original logo and animation appear.
so if some one can help me delete that logo that appears at the first.

Go on system folder and open media. There must be boot animation files.if you see more than one delete one.you must be rooted. Maybe you could even see the animation. I don't have a your phone so try this.if you delete both animation always can from Internet download some new.
Hope this helps you.