Micro SD don't have a switch, so it's on firmware or something like that.
https://unix.stackexchange.com/questions/138518/how-to-format-write-protected-sd-card
says hdparm can help.

On Feb 2, 2018 19:00, "Lennart Sorensen via talk" <talk@gtalug.org> wrote:

> On Fri, Feb 02, 2018 at 01:21:39PM -0500, Evan Leibovitch via talk wrote:
> > Hey there. Subject says it.
> > Regular SD cards have a physical switch but MicroSD don't, yet I can't
> use
> > this because it's reported as write protected.
> >
> > Any suggestions? Is it a micro-brick?
>
> I have a card in that state.  I have never found a solution to fix it.
>
> Pretty annoying.
>
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> Len Sorensen
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