How to access bricked phone /system folder? Fix corrupted file
On custom recoveries (CWM, TWRP) you normally are able to use adb. With that you can delete the corrupted bootanimation and replace it with your original one.


Mount your /system partition using "Mount->System" on TWRP or "Mounts and Storage->mount /system" on CWM
Plug your phone onto the computer
Remove your corrupt bootanimation: adb shell "rm /system/media/bootanimation.zip"
Restore your old bootanimation: adb shell "mv /system/media/bootanimation.old /system/media/bootanimation.zip"
You may have to set the right permissions: adb shell "chmod 0644 /system/media/bootanimation.zip