[Q] change Boot Anmiation. Cant edit /system/media topic

Hi guys,

I need to restore my original boot animation on the Xperia Z as I had accedently deleted it a while ago. I have found it, but can not copy it into /system/media. Various file explorers have all told me that the copy process is not possible.I am really desperate right know, I have no idea what to do.

The phone is rooted, the downloaded file is not on my sdcard.

Oh yes, my MicroUsb port is broken so i can't connect my phone to the pc, everything has to be done right on the phone.

Thanks in advance