Danois90:
This code "const PROGMEM char bootNotice[]" means array of char, usually assigned with either of:const char msg1[] = {'a','b','c','\0'};
const char msg2[] = "abc";
Both the above will yield the same output.
So, if it's multiple sentences like I have, should it be:
const char msg[]= "sentence\n"
"sentence2\n"
or
const char msg[]= "sentence\n sentence2\n"
or even
const char msg[]= "sentence\n
sentence2\n"