The immobiliser ECU is manufactured with the code of ten possible chips, the details of those codes are kept by BMW in Germany, any new key is supplied with the next available code (which is why the keys take so long to come from Germany)
There is nothing in the immobiliser ECU or the chip that can be programmed by T4. I wonder if it is the immobiliser ECU that has 'lost' the details of the chip, have you tried disconnecting the battery for a while as suggested by Jules?
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