I wanted to get back to you on this sooner but I haven't had much free time.I'm looking for the bootloader of the MCU board from Typhoon H. I have some MCU boards to test different files. It would be nice to go forward and back with Thunderbird firmware and stock firmware..
After going through the files I received, I do not see the bootloader you are looking for.
However, I sent a reply email to the guy who gave me all these files and asked him if he might have them. I am waiting for him to reply. I will let you know.
Is there a way to extract a bootloader from older boards? I do have several of the old ones sitting around.