add link (#1668)
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@ -28,6 +28,21 @@ Here are two ways to flash the bootloader:
Note: The serial port name (`/dev/ttyACM0`) may differ depending on your operating system. Make sure to identify the correct port name for your setup.
6. Continue with the normal [flashing instructions](/docs/getting-started/flashing-firmware/nrf52/drag-n-drop)
### Extra RUI3 Steps
If the above steps fail with errors like:
```bash
Touched serial port COM11
Opened serial port COM11
Starting DFU upgrade of type 2, SoftDevice size: 0, bootloader size: 39000, application size: 0
Sending DFU start packet
Timed out waiting for acknowledgement from device.
Failed to upgrade target. Error is: No data received on serial port. Not able to proceed.
```
You will need to follow the first part (through the `AT+BOOT` command) of the [Converting RAK4631-R to RAK4631](https://docs.rakwireless.com/product-categories/wisblock/rak4631-r/dfu/#converting-rak4631-r-to-rak4631) instructions.
## Debugger
This conversion requires the use of either a [DAPLink](https://daplink.io/) or [J-Link](https://www.segger.com/products/debug-probes/j-link/). The most reasonably priced and available is the [RAKDAP1](https://store.rakwireless.com/products/daplink-tool).