<p></p>
<p><b>@miri64</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16777#discussion_r695450965">boards/feather-nrf52840/doc.txt</a>:</p>
<pre style='color:#555'>> @@ -35,17 +35,26 @@ use an external Segger J-Link Programmer connected to the [SWD Connector].
 #### Flashing the uf2 bootloader
 
 To flash the uf2 bootloader (if its no longer present on your BOARD) then with
-a jlink attached to your BOARD and `nrf52prog` installed:
-
-$ git clone git@github.com:adafruit/Adafruit_nRF52_Bootloader.git
-$ cd Adafruit_nRF52_Bootloader
-$ make BOARD=feather_nrf52840_express all
-$ make BOARD=feather_nrf52840_express flash
+a jlink attached to your BOARD and [`nrfjprog`][nrfjprog] installed:
+
+~~~~~~~~~~~~~{.sh}
+git clone git@github.com:adafruit/Adafruit_nRF52_Bootloader.git
+cd Adafruit_nRF52_Bootloader
+# only download what is needed, use
+#     `git submodule update --init --recursive`
+# to download everything
+git submodule update --init -- lib/nrfx lib/tinyusb lib/uf2
</pre>
<p>Not for me... See line below.</p>

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