This is just for interest sake, only, for now. I recently bought a Nano, to go inside a gizmo. Failed to upload a test prog. at first. I had to select Nano (with old bootloader). For this instance, it doesn't matter, as it is a one off. So, for the sake of any future occurence, I would like to know how I upload a new bootloader. I know it can be done from an external programmer, and doing a quick check, I found I could use a Uno to do it.
Ok. I have the H/W but a) where would I find the new Bootloader file and b) what S/W would I need to actually do it?
Sorry if this is a stupid question.