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It's just that the memory you used is too "new" for this kernel to recognize. Unfortunately, Amazon has not upgraded the diagnostic kernel.
As for the "sec" number, unfortunately, this is a great secret of Amazon. I tried once after replacing the memory to recover this number from them but apparently they do not have it in any database. It looks like it must be somehow related to the rest of the serial numbers. In any case, without it, you will no longer register this reader. The only option is to solder back the old Flash memory and make a backup of all numbers.
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