DFU zip is big when including bootloader

Question

I'm using SDK 15.3 and nrfutil version 4.0.0 for generating DFU zip files. 
 When I generate a DFU zip file that includes the bootloader the zip files is far to big. 
 This is my source hex files SD + AP + BL : 
 297.137 ble_app_buttonless_dfu_s132.hex 423.649 s132_nrf52_6.1.1_softdevice.hex 66.035 secure_bootloader_ble_s132.hex 
 nrfutil pkg generate --hw-version 52 --application ble_app_buttonless_dfu_s132.hex --application-version 0x01 --sd-req 0xB7 --key-file private.pem Tag_sdk153_APv0.0.1.zip 
 106.325 Tag_sdk153_APv0.0.1.zip 
 nrfutil pkg generate --hw-version 52 --sd-req 0xB7 --bootloader-version 0x01 --bootloader secure_bootloader_ble_s132.hex --key-file private.pem Tag_sdk153_BLv0.0.1.zip 
 511.553 Tag_sdk153_BLv0.0.1.zip 
 Here the generate DFU file explode in size (511KB) compared the original bootloader hex file (66KB) and the same seem to happen whenever the bootloader is part of the generated DFU file. 
 765.344 Tag_sdk153_APv0.0.1_SD_BLv0.0.1.zip 489.964 Tag_sdk153_SD_BLv0.0.1.hex 659.362 Tag_sdk153_SD_BLv0.0.1.zip 
 Can anybody explain this ? and are there anything I can do to shrink the files ?

Jesper W. · Accepted Answer

Found the answer in https://github.com/NordicSemiconductor/pc-nrfutil 
 When creating update packages of bootloaders compiled from nRF5 SDK 15.3.0 and higher, nrfutil version 5.0.0 must be used. This is because of changes to the bootloader projects in the nRF5 SDK, and if an old nrfutil version is used the size of the generated packages will be too large. 
 
 :-)

DFU zip is big when including bootloader

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