###### ####### # # # # # ###### # # # # ###### # # # ## # # # # ## ## # ###### # # # # ##### # # # ## # ##### # # # # # # # # # # # # # # ## # # # # # # # # # # ###### # # # # ###### PineTime 40 - Bootloader PineTime 40 - Bootloader Pinetime nRF52840 secure bootloader