I made a list of all the functions present in the keyboard, but I have not been able to figure out what the F4 and F7 functions are. The Fn+ F4 combo is a picture of a file with an asterisk in the middle while the FN + F7 combo has a picture of a light bulb being crossed out. Fn + F7 does not turn off back lighting so not sure what it's for.
Here is the list:
