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[border-router] add info about required flag for dongle in OpenThread Border Router Setup guide #195

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jwhui merged 4 commits into from
Jan 22, 2026
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[border-router] add info about required flag for dongle in OpenThread Border Router Setup guide #195

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Adding info about required flag for dongle
jrhodie Jan 13, 2026
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Adding info about required flag for dongle
jrhodie Jan 14, 2026
53b0000
adding info about required flag
jrhodie Jan 22, 2026
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adding info about required flag
jrhodie Jan 22, 2026
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2 changes: 2 additions & 0 deletions site/en/guides/border-router/prepare.md
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Expand Up @@ -12,6 +12,8 @@ as a Full Thread Device (FTD) in the design you chose.
* A Raspberry Pi for the Thread border router.
* 2 Nordic Semiconductor nRF52840 USB Dongles (one for the Co-Processor and one for the Thread end device).

When building firmware for the nRF52840 USB dongles, you must use the flag `-DOT_BOOTLOADER=USB`. This flag is required for both RCP and NCP designs to configure the correct memory map for the pre-installed Bootloader and to enable the USB DFU trigger. If the flag is not present, the compiled firmware cannot be loaded onto the dongle.

## Step 2: Build and flash Co-Processor firmware

Follow the instructions based on the design you chose.
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