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Typical scenario
**user code takes care of several tasks including the programming of eFUSEs; in particular:
***<code>SDMMC_MFG_DISABLE</code> is blown [3] in order to disable permanently ''manufacture mode''
***<code>BT_FUSE_SEL</code> is blown in order to indicate to Boot ROM that eFUSEs have been programmed
***<code>FORCE_INTERNAL_BOOT</code> is blown in order to ignore <code>BOOT_MODE</code> pins from now on
***depending of application's security requirements, other eFUSEs may be blown; for example <code>SDP_DISABLE</code> is blown in case serial download has to be completely disabled
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