Nobody likes having their existing stock shipped back and forth between resellers and customers to get updated/replaced while the product is being advertised as jtag programmable by the end user precisely for these kind of situations. It's a big waste of time and money getting a good chip this way. Especially when you know there won't be any more updates later down the road also (D2E?). They might as well skip the whole jtag connector and cable.
I understand they are protecting their property but I'm sure if they made better protection their firmware images wouldn't be so easy to use for cloning.
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