Feature: Fancy DFU on `blackpill-f4` #1850

Job	Run time
size-diff	42s
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 30s
build-mingw (windows-2022, ucrt64)	2m 46s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 28s
build-mingw (windows-2022, clang64)	2m 28s
	12m 54s

Provide feedback