check the layer media type before flashing #100

Job	Run time
Lint	27s
Test	1m 1s
Build (x86_64-unknown-linux-gnu)	40s
Build (aarch64-unknown-linux-gnu)	1m 40s
Build (aarch64-apple-darwin)	49s
Build (aarch64-unknown-linux-musl)	1m 37s
Build (x86_64-apple-darwin)	55s
	7m 9s

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