<p><b>@smlng</b> requested changes on this pull request.</p>

<p>tested and works as advertised <g-emoji class="g-emoji" alias="smile" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f604.png">😄</g-emoji> However, I would prefer to split this into 2 commits (1 for Makefile, 1 for remove flash.sh), too.</p>

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