Missing "start DFU" button on DFU mode

[AdvaLevit]

I Upgraded the software to V3.6.1. The button "Start DFU" is missing from the SFU mode screen. After choosing a Zip file there's nowhere to continue.
Had to downgrade the software back to 3.5.0

[AdvaLevit]

Hi,
Sorry for misleading you
but i meant that our APP SDK is 15.2.0
Our DFU is based on the 15.0.0 SDK
nRF5_SDK_15.0.0_a53641a\examples\dfu\secure_bootloader 

[Vidar Berg]

No worries! but I wasn't able to replicate it with 15.0.0 bootloader either. Is the "Secure DFU Service" displayed when the DFU button is missing?