https://www.ezurio.com/support/faqs/issues-flashing-custom-firmware-bl65x-using-segger-embedded-studios-ide
Issues with Flashing custom firmware to BL65x using Segger Embedded Studios IDE | Ezurio
The BL652, BL653, and BL654 modules come preloaded with our smartBASIC firmware. When flashing custom firmware using Segger IDE it is necessary to do a full...
custom firmwareembedded studiosissuesflashingusing