@hukaulaba btw: there should be two small fat16 partitions, the second one should contain bootloader, veneer and hal and the latter two might be useful and otherwise undumped.
the drivers in \winnt\system32\drivers in OS partition may also be helpful.
i found a dump of the ofw that someone else made, but it's incompatible with halfire somehow (crashing after jumping to kernel, which got misinterpreted as crsshing when loading cdfs as that's the last driver setupldr loads)
i know that you can dump the old firmware image before flashing a new one but i'd need to do some reversing to figure out how to dump the firmware image in software...