just download small firmware editor its name is
ALI360X-ALI351X_Tool_test1
i have lost its link but you can download it from different sites
screenshot will speak its self.
it works only with 1.71 version and repacks it.
i am not responsible for any damage to your STB if it bricked but i have tested it and it worked on my STB
in this photo open editor and load firmware
Press Unpack
the extracted firmware will be in same folder
go to menu and background photo
now you can edit your own boot photo but movie format and resolution must be same and try to add max 4 seconds video.
now repack and select extracted folder
and press repack
you have done it just copy to usb drive and update firmware
