Fix firmware loading, finally #140

Job	Run time
Linux (aarch64) / build (Debug)	19s
Linux (aarch64) / build (Release)	22s
Android / build (Debug)	1m 6s
Android / build (Release)	1m 5s
Linux (x86_64) / build (Debug)	1m 10s
Linux (x86_64) / build (Release)	1m 36s
iOS / build (Debug)	1m 33s
iOS / build (Release)	1m 35s
macOS (Universal) / build (Debug)	1m 42s
macOS (Universal) / build (Release)	2m 52s
Windows (x86_64) / build (Debug)	7m 36s
Windows (x86_64) / build (Release)	7m 45s
	28m 41s

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