What I'm saying is that if the guy locked your DME, I believe he just simply lock it so no one else can touch it. I don't think it has anything to do with "losing the flash" when battery is disconnected.
There's a reason why they call it "flash" because you ONLY "FLASH" ROM not RAM. Another wway of looking at is you don't lose memory from your "flash drive" (aka usb stick) when you remove it from your computer.
For more clarification, I suggest you google ROM (Flash ROM) vs RAM.
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