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NRF52840 dongle USB bootloader with external power supply

In section 6.3.2 of the NRF52840 dongle user guide it describes how to modify the board for use with an external, regulated power supply.  Once those modifications are made to the board, is it still programmable using the USB bootloader (with or without the external supply connected)?

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  • If you break SB2 and connect SB1, you will just disable the regulator so that you can power the chip externally. VBUS is still connected to the VBUS pin of the nRF52840 to power the USB-PHY. Make sure SB2 is completely disconnected, else you may damage the chip when VBUS is applied to the USB connector. I can't see why it shouldn't work, unless something is broken.

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