This covers the readonly filesystem, but doesn't cover the write protect flag that you can set on the microSD card itself[1]. The flag will configure the card's

This covers the readonly filesystem, but doesn't cover the write protect flag that you can set on the microSD card itself[1]. The flag will configure the card's controller to drop any writes, and is thought to resist the corruption issues that can still occur even when the filesystem is readonly. Also, creating a readonly root out of an existing disto is a bit of a pain, my preference is to use a distro (like TinyCore) that's already a readonly root. https://github.com/BertoldVdb/sdtool https://github.com/BertoldVdb/sdtool