Thanks for your post.
Unfortunately, there is no logo editor for the 4x40. You will have to do it the long way. First save the custom characters using the Save Startup Custom Characters command (cmd 194 - section 6.5 of the
manual). Then send the Change Startup Screen command (cmd 64 - section 5.5). To include your custom characters, you will have to add them in the parameters of cmd 64, calling their reference Id's (0 to 7).
Please let me know if you have any more questions.
Best Regards,