You got me checking this boot flag thing and after some, OK quite a bit of searching, there is a change to the actual ROM in camera. The boot flag is set to look for a boot-able card and if none is found it continues to boot as normal. However, if it does find a boot-able card then the boot instructions on the card are loaded. As you say, it is no big deal and in my opinion not worth considering. But thanks for making me search out all the facts. It also is a reversible option... but why???
Peterff wrote:
I haven't discovered an issues with using cards without ML on it, it defaults to standard operation, but I do tend to follow the instructions. Essentially it seems related to the boot flag, so it looks for ML if you have installed it, but if you uninstall it, then it resets to the factory standard. Not a big deal, but may be worth considering.
As you say, each version is camera specific, AND firmware version specific, so paying attention to detail is important. As with all thing YMMV.