Protect UICR

Question

Hello i have a rigado BMD-300 module and i would like to flash a new version of softdevice app and bootloader but i want to protect the UICR memory because that is where the MAC addr of the module is stored. 
 Is there any way to flash everything without touching the UICR ? 
 If so can you tell me a better way do to this ? 
 Thanks for the help

run_ar · Accepted Answer

UICR will be deleted if you erase all. However if you erase only the pages you use for your application you should be able to flash again without erasing the uicr. i.e. use the sector erase option when programming with nRFjprog. 
 --program <hex_file> [--sectorerase | --chiperase | --sectoranduicrerase] [--qspisectorerase | --qspichiperase] Programs the specified hex_file into the device. If the target area to program is not erased, the --program operation will fail unless an erase option is given. Valid erase operations for the internal flash memory are --sectorerase, --sectoranduicrerase and --chiperase. If --chiperase is given, all the available user non-volatile memory, including UICR, will be erased before programming. If --sectorerase is given, only the targeted non-volatile memory pages excluding UICR will be erased. If --sectoranduicrerase is given, only the targeted non-volatile memory pages including UICR will be erased. Note that the --sectoranduicrerase and --sectorerase operations normally take significantly longer time compared to --chiperase operation so use them with caution. If your device is equipped with a QSPI peripheral and an external memory device is present, data targeting the XIP region will be written to the external memory device. The first address of the XIP region is considered as address 0 of the external memory device. To determine if an external memory device is present, nrfjprog checks the MemSize paramter from QspiDefault.ini file or from the QSPI configuration ini file given with the --qspiini option. If the target area to program is not erased, the --program operation will fail unless an erase option is given. Valid erase operations for the external memory device are --qspichiperase and --qspisectorerase. If --qspichiperase is given, the external memory device will be erased. If the --qspisectorerase is given, only 4kB pages pages from the targeted external memory device will be erased. Note that --qspichiperase operation may take several minutes. The --program command can be combined with the --verify operation. It can also be combined with either the --reset or the --debugreset operations. the reset will occur after the flash operation in order to start the execution. Limitations: For nRF51 devices, the --sectoranduicrerase operation is not available. For nRF51 devices, if the hex_file provided contains sectors belonging to region 0, the --program operation will fail. For nRF51 devices, the --qspisectorerase and --qspichiperase operations are not available. For nRF52 devices, the --qspisectorerase and --qspichiperase operations are not available unless the device is equipped with a QSPI peripheral and an external memory is connected. To determine if an external memory is present, the MemSize parameter from QspiDefault.ini file or from the QSPI configuration ini file given with the --qspiini option is evaluated

Protect UICR

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