Ok. In that case Notecard Outboard Firmware Update probably isn’t an option, as it requires some sort of boot/update integration on the host side.
There are ways you could do some degree of firmware updating, but they’re all going to be manual and non trivial. This older forum post talks through the approach that I think is most sane. It should be possible, but we unfortunately don’t have any examples and haven’t tried it ourselves.
TJ