Best way to flash Softdevice to Seeed XIAO nRF52840 Plus

Hello! 

I want to develop a Heartrate Monitor Device which uses BLE and ANT+ using the Seeed XIAO nRF52840 Plus Board. 

Now that I have the board I found out that ANT doesn't Work without flashing the Softdevice S340 to it. I have tried some outdated Guide I found for an Adafruit board but that did not get me far.

So what is the Best / easiest Way to get the Softdevice updated on the Seeed Board?

Thank! 

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