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How to update to Softdevice S212?

Hi, I have an Adafruit Feather52 board which is preloaded with a serial DFU bootloader and the S132 Softdevice, of which I also have the merged Hex file. I would just like to update to the Softdevice S212 (ANT stack), but also preserve the existing bootloader in flash. I have tried everything but nothing works. It seems as if always the bootloader gets erased from memory as well when I flash the downloaded Softdevice. Is there a way to just simply flash only the Softdevice by itself? I downloaded S212 V4.02 (ANT_s212_nrf52_4.0.2) from the official thisisant.com site. I have a Segger J-link, ST-LINK V2 and all available tools to do flashing/programming. I can also always recover the board through the J-link with the original bootloader file provided by Adafruit. Any hints and tips are more than welcome! Peter

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