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?
I need to prevent a phone from having its firmware/ ROM updated. I already
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Fortunately, no.