Android: disable SD card/ do not allow mounting of the SD card
<p>I need to prevent a phone from having its firmware/ ROM updated. I already disabled lots of stuff like USB debugging, but people can still go to the recovery mode by pressing Vol+ and rebooting the device and then flash a new firmware from the SD card. 
Can I somehow disable the SD card slot completely without physical changes to the device or writing my own firmware?</p>
