For some time now I can't get from the standard clock app into the menu with BTN2. The button works, because I can wake up the clock with it. I tried to install the latest firmware. When trying to update the firmware to 2v05.56 with DFU I only get the error message "upload failed: insufficient resources". So I installed 2v05.48 successfully.
Apart from the DFU mode I can't connect to the clock via Bluetooth anymore, neither via the IDE, the App Loader nor via gadgetbridge.
Shortly before the clock app starts, "-> null" appears at the bottom left of the start screen.
I don't know what else I could try. I'd appreciate it if someone could help me.