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DFU via own protocol

Hi,

we are developing a device with 2 µC one being the nRF52832 for BLE connectivity.
We want to do DFU via BLE with our own protocol. From what I've read, in this case some sort of Background DFU is the way to go.
So far I've saved the new firmware to the flash but I'm not sure what to do with the init file. Where do I need to save it to? Or are there other things I need to do first with this file?
I'm using SDK14.2.0 with Softdevice 132 Version 5.0.0 and the IoT Bootloader.

Thank you in advance.