Unlike the SAMD21 and SAMD51, you cannot 'abuse' the reset button to have a double-click-reset for jumping into the bootloader.

Instead, we have a separate button for entering bootloader or factory reset mode

nRF52840-DK (PCA10056)

Holding down Button1 while clicking RESET will put the board into USB bootloader mode

Holding down both Button1 & Button2 while clicking RESET will put the board into OTA (over-the-air) bootloader mode

This guide was first published on Aug 29, 2018. It was last updated on Aug 29, 2018.

This page (Bootloader Details) was last updated on Apr 18, 2021.

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