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Background DFU support for Bootloader update

Does the current background DFU support (if not is there a plan to support) Bootloader and SoftDevice updates? It will be extremely useful to update the BL and SD through the Background DFU method. in SDK 15.2.0, there was code which seemed to allow BL/SD updates like TFTP_DFU_IMAGE_TYPE_BOOTLOADERTFTP_DFU_IMAGE_TYPE_SOFTDEVICE but there was also TFTP_SOFTDEVICE_UPGRADE_SUPPORT which was set to false. It would be great to get some pointers to documentation for this support or reasons for not taking that course.

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