I know this topic's already marked solved, however wanted to add something interesting that I found in my travels.
If for some reason a software software controlled read-only switch isn't sufficient, it is actually possible to make a MicroSD card read-only.
https://github.com/BertoldVdb/sdtool
I'll still echo that overlayroot is generally the way to go. But in some applications that may not be sufficient.
And the permlock function does work as adve
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Posted by tparys,
Also worth mentioning
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