Yesterday SDK 4.1.4 reached me. I tried if the SIM is now working with BLE on Windows with nrf52840 USB stick. But still had no success yet. The SIM does no more "freeze" after the COM port of nrf52840 stick is entered. And the green LED on the stick is flashing intensly. Both did not happen with 4.1.3. But i still cannot see any BLE functions of my app working in the SIM.