How to change bootloader to uf2 on NRF52840 dongle

RE: How to change bootloader to uf2 on NRF52840 dongle

Einar Thorsrud — Mon, 20 Feb 2023 14:28:27 GMT

We only produce the latest revision and do not keep stocks of old DK's. You could check with some distributors though, perhaps you will get lucky.

RE: How to change bootloader to uf2 on NRF52840 dongle

skelly7769 — Mon, 20 Feb 2023 14:08:44 GMT

It probably was made with older sdk because it was made for the chips inside the VALVE INDEX VR headset. is it possible to contact nordic and change 2.1.1 dongles out for 2.0.0?

RE: How to change bootloader to uf2 on NRF52840 dongle

Einar Thorsrud — Mon, 20 Feb 2023 13:45:27 GMT

That depends on the application, but I suspect that it is related to that 2.1.0 introduced revision 3 of the nRF52840, and this is also used in 2.1.1. If the firmware is built with an older SDK, it will not be compatible. See IN-141.

RE: How to change bootloader to uf2 on NRF52840 dongle

skelly7769 — Mon, 20 Feb 2023 13:17:46 GMT

Okay. by the way do you know why a program doesnt work for nordic pca10059 dongle version 2.1.1 when it did for 2.0,0?

RE: How to change bootloader to uf2 on NRF52840 dongle

Einar Thorsrud — Mon, 20 Feb 2023 08:28:00 GMT

Hi,

I have no knowledge of the Adafruit UF2 bootloader, but regardless of that, the only way to replace the bootloader on the nRF52840 dongle is via a SWD debugger. So you need to solder on a pin header an use a debugger. Make sure to avoid a reset after doing the chip erase, or use a debugger that can work with varying voltages (ref the section about Using an external debugger in the nRF52840 Dongle Programming Tutorial).