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Bootloader programming issue The flash is not erased

ting²

Hi everyone, I am using the nRF51822, I have an issue of programming the bootloader. It is said that the flash is not erased. But I just did an erase all before programming. Is there anyone who encountered the same issue? Thanks!

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    @bjorn-spockeli this may be true for the time when application is running but my experiments suggest that P0.21 should be left disconnected during interaction with J-Link, esp. during flashing. Otherwise various unexpected things happen. As I understand the documentation P0.21 should be ordinary GPIO unless PSELRESET registers are set. Please advise is that a correct interpretation. Maybe documentation should be clarified in that matter?

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    @bjorn-spockeli this may be true for the time when application is running but my experiments suggest that P0.21 should be left disconnected during interaction with J-Link, esp. during flashing. Otherwise various unexpected things happen. As I understand the documentation P0.21 should be ordinary GPIO unless PSELRESET registers are set. Please advise is that a correct interpretation. Maybe documentation should be clarified in that matter?

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