My huawei ascend g510 is in a bootloop how to stop this?

[AC Question]

I have a huawei ascend g510 and i rooted it.
I installed yesterday first a new bootanimation iT worked.
But after that i installed a theme and restart and iT endless boots
I dont have a costum recovery / rom and if i try aroma filemanager its says

Finding update packages
Opening update packages
Verifying update packages
Formatting /cache...
Installation aborted.

And that is iT with all zip things like clockworkmod