Mario, There are 2 different memory regions in play here. The Z1-DIAG, is contained in OTP memory, and is what is used to enable MPOST in a customer system. The Z1_DIAG register, is meant to hold the contents of the Z1-DIAG as it applies to MPOST. This should be loaded by the BROM on power up by the device, and will be read only from the CPU. Best, Matthew
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