Reboot and Only Power LED

[Tobi]

Please connect your station to a PC/Laptop via USB and then boot in DFU mode by keeping BOOT0 and RESET buttons pressed, then release RESET before BOOT0. You computer should detect some new USB device. If nothing happens, then there's a problem with the 3.3V voltage or a problem with the CPU.

Do you have the piggyback module installed?