How is that relevant? No matter what protocol they are using to communicate, it is quite conceivable that the erase commands are not properly implemented. In f

How is that relevant? No matter what protocol they are using to communicate, it is quite conceivable that the erase commands are not properly implemented. In fact, as the comment you're replying to pointed out, there have been many devices found historically which do not properly implement erase commands. Since you can't(*) bypass the flash controller and see what's actually in the flash, there is no way to verify whether or not the data has in fact been deleted. Just encrypt your device. It's so damn simple. (* Yes of course you can desolder the memory or hook up to it directly and bypass the flash controller that way, like the authors of the paper in GP, but that's far beyond the capabilities of even the average HNian)