Henry Jacobs

Important changes to forums and questions

All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.

9 years, 1 month ago.

No MBED drive after updating interface to Bootloader drive.

I can no longer see MBED drive after doing an upgrade of the interface to the Bootloader Drive. This is after waiting a couple of minutes and then removing and re-inserting the USB dongle.

Question relating to:

Last updated: 27 Aug 2020
BLE Nano is the smallest Bluetooth 4.1 Low Energy (BLE) development board in the market. The core is Nordic nRF51822 (an ARM Cortex-M0 SoC plus BLE capability) running at 16MHz …

Does the drive come back up in bootloader mode if you connect to USB while holding the reset button?

posted by Sam Grove 10 Mar 2015

Yes, the bootloader mode appears if I hold the reset button while connecting to USB, and also if I just press the reset button after connecting to USB.

posted by Henry Jacobs 10 Mar 2015

2 Answers

Brian Johnson
8 years, 11 months ago.

I had the same experience. After I copying the new firmware to the bootloader drive the MBED drive no longer appears. The LED on the MK20 USB dongle no longer lights but the LED on the BLE Nano blinks about 20 times, misses a beat and then repeats over and over. If I press the reset button the BOOTLOADER drive does appear and the LED on the MK20 USB dongle flashes slowly while the LED on the BLE Nano blinks about 20 times, misses a beat and then repeats over and over.

Mark Sutheran
8 years, 11 months ago.

Try loading the bootloader and copying over the file again... repeat till it's back to normal (checksum would be nice)