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  • Yes you can write modified data there as the sha256 hash is checked after it is all written, but then it will mark it invalid and won't execute it. So either you have bricked device sitting in DFU waiting for correct package or with dual banked update (when there is enough space) the new invalid code is sitting in empty space above the real application waiting for you to jump into it via some clever exploit of original application over BLE
    EDIT: or softdevice, I think there is a reason why S132 2.0.0 and S132 3.0.0 are no longer available from downloads here https://www.nordicsemi.com/Products/DeveĀ­lopment-software/s132/download

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