In short, would it be possible to change te LED output while flashing a new sketch?
My Arduino will be in a case, and thus there is no visual output while Flashing the device.
I have Googled a few things but haven't found anything so far.
would this be possible by changing the bootloader or is that something entirely different?
It's a project on a nano.
I suppose what the program does doesn't really matter as changing the flashing process hasn't got anything to do with the sketch that is flashed onto the board?