Just a query my XL is on 4.3.0 and would not mind updating it to 4.5.0 so you say underlined you can but how I cannot seem to do this bit? or do you need a full retail game to update In system nand:-
Can I update from 4.2 or 4.4 to 4.5?
Yes, but it's NOT NEEDED.
You can use a game cartridge (Luigi Mansion, or animal crossing for example)
You can also use Gateway without emuNAND partition, press UP when entering Gateway Mode and launch Luigi Mansion or any other 4.5.0-x game
Can I update from 4.2 or 4.4 to 4.5?
Yes, but it's NOT NEEDED.
You can use a game cartridge (Luigi Mansion, or animal crossing for example)
You can also use Gateway without emuNAND partition, press UP when entering Gateway Mode and launch Luigi Mansion or any other 4.5.0-x game