Open (Do not unpack) the file branding.zip.
It has Loading.bmp file
Its name the file and copy loading.bmp in place of the deleted
PS. If you do not branding.zip, the file is in the file loading.bmp data.zip/ui_android - in one of three folders contained therein (you have to change the folder 800_480).
Change just as I said above - without unpacking data.zip