SMP McuMgr DFU source code

Hello,

I have added DFU capabilities to my NRF54L15 project using:

CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y

and

SB_CONFIG_PARTITION_MANAGER=y
SB_CONFIG_BOOTLOADER_MCUBOOT=y

I can sucessfully update the device with the official nRF Connect app for iOs (not nRF Connect Device Manager app). However for better user experience I want to implement the DFU into my flutter (dart) desktop app.
There are so many different repositories containing McuMgr, DFU, legacy DFU and so on that I got lost. 

Could anyone point me to the latest correct repo?

The ones I found was: https://pub.dev/packages/flutter_nordic_dfu which supports Android and iOS for NRF52 and NRF51. Can this be used as a base for NRF54L15 as well? I may need to add cross platform support, but that should be fine with todays tools.
Thanks
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