USB/BLE DFU bootloader

A USB/BLE Bootloader for APP3.0 Board/nRF52840 chip complying with

• https://www.usb.org/sites/default/files/DFU_1.1.pdf
• https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v11.0.0%2Fbledfu_transport_bleservice.html

Bootloader can be found in the following path COINES\v2.6.0\firmware\app3.0\bootloader_update