SDK12 DFU service not found

[jpolvi]

I am developing software for a custom hardware based on NRF52. Previously I was tasked on updating the old NRF51 based software (used on older version of the device) for NRF52 using SDK11. Once that was done my next task was updating the software for SDK12. The software is otherwise working fine but I am having problems with DFU. I tried creating a zip of the application and flashed the combined softdevice/bootloader from SDK12 examples folder (dfu/ble_dfu_send_hex) to the device. The device shows as DfuTest on the mobile DFU app but when I try to upload the zip all I get is "DFU service not found". I also tried compiling the secure DFU bootloader example and using that instead but the result is the same.

Do I need to also have DFU support in the application for that to work ? Currently the application has some kind of DFU functionality from the earlier SDK 11 implementation but I'm guessing that wont work. Any examples to study so that I can implement the functionality ?

[jpolvi]

As I mentioned in my previous edit the problem seems to be the outdated version of NRF toolbox and NRF Connect. I updated both and then tried again. I did it as follows:

1. flash softdevice to the device (S132 v 3.0.0)
2. flash bootloader (I used the SDK 12 secure bootloader compiled using the public key from the private key I had created)
3. Create zip from the application using the private key as signature.
4. Upload using NRF DFU tool

The upload worked without problems and the software started flawlessly (as evidenced by the debug logs in TeraTerm). However, it seems the DFU functionality in the application is not working since if I try to do an update while the application is running I get the "DFU service not found" error. What would be the proper way of implementing that under SDK 12 ?