nRF52840 now requires an erase all after every power cycle
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jonathanpallant commented
See https://infocenter.nordicsemi.com/pdf/in_141_v1.1.pdf?cp=4_0_2_7
In factory state, the nRF52840 revision 3 comes with the access port protection enabled. An ERASEALL command via the control access port (CTRL-AP) is required to enable access.
I guess this is to stop people using the debug interface to hack / dump the firmware for some proprietary product they've just bought with an nRF52 inside it.
jonathanpallant commented
Noted in #80