Some Chromebooks have a &quot;flash write-protect screw&quot;[1] that basically makes the firmware read-only. Acts as a physical protection for flashrom by software (though I am not sure if there are ways to work around it).<p>[1]: <a href="https:&#x2F;&#x2F;www.chromium.org&#x2F;chromium-os&#x2F;developer-information-for-chrome-os-devices&#x2F;acer-c720-chromebook" rel="nofollow">https:&#x2F;&#x2F;www.chromium.org&#x2F;chromium-os&#x2F;developer-information-f...</a>