Ok some people are having problems getting the modified logo back into the TV.
First of all make sure the file DownloadBI.MBxxx is spelt with bi not bl this is why some people cannot get the TV to send the logo.jpg file to the USB stick.
Edit the file ensuring its resolution is the same I.e. 1920x1080
If the method to upload the new file mentioned previously does not work use the TVs media player to view the new logo and then move to the gear wheel icon and select it, then go to options and select "Set Boot Logo"
Confirm and it's done.