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Cyber60 Bootloader Flash Instructions

I recommend using a J-Link programmer to flash the bootloader. If you want to use another programmer, I suggest checking out Joric’s wiki for instructions:
https://github.com/joric/nrfmicro/wiki/Bootloader

TL;DR:

If your PCB already has the bootloader flashed (either from the factory or previously), you can update it by dragging the UF2 update file from the release.
Be sure to use the correct update file for your PCB revision.

Mac / Linux:

  1. Install nrfjprog (via nRF Command Line Tools)
  2. Download the bootloader (.hex file):
    https://github.com/4pplet/Adafruit_nRF52_Bootloader/releases
    Make sure it matches your Cyber60 revision.
    Revisions A and B use the same bootloader.
    Look for the letter under the "cyber60" name on the PCB.
  3. Open a terminal and navigate to the bootloader directory.
  4. Connect power to the PCB (USB or battery), and connect your programmer (via tag-connect or 2.54 header).
  5. Flash using: 
    nrfjprog --program [bootloader_name].hex --chiperase -f nrf52 --verify --reset
  6. If you get a "device is locked" error: 
    nrfjprog --recover
    Then retry the flashing command.

Expected success output:

[ #################### ]   0.218s | Erase file - Done erasing
[ #################### ]   1.293s | Program file - Done programming
[ #################### ]   1.337s | Verify file - Done verifying
Applying system reset.
Run.
  1. If successful, your PCB should show up as a USB drive named CYBER_<Revision>.
    If it doesn’t, try:
    • Unplugging and replugging USB + battery
    • Double-clicking the reset button to enter bootloader mode

Windows:

  1. Install nRF Command Line Tools
  2. Install J-Link drivers
  3. Download the appropriate bootloader .hex file from:
    https://github.com/4pplet/Adafruit_nRF52_Bootloader/releases
    Again: use the version that matches your PCB revision.
  4. Either:
    • Copy the bootloader to your nrf-command-line-tools folder (e.g. C:\Program Files (x86)\Nordic Semiconductor\nrf-command-line-tools\bin\)
    • OR copy nrfjprog.exe into the folder where the .hex file is
  5. Open Command Prompt
  6. Navigate to the correct directory
  7. Connect USB/power to the PCB and attach your programmer
  8. Run: 
    nrfjprog.exe --program [bootloader_name].hex --chiperase -f nrf52 --verify --reset
  9. If you get a "device is locked" error: 
    nrfjprog.exe --recover
    Then retry the flashing command.

Expected success output:

[ #################### ]   0.218s | Erase file - Done erasing
[ #################### ]   1.293s | Program file - Done programming
[ #################### ]   1.337s | Verify file - Done verifying
Applying system reset.
Run.
  1. If all goes well, you should see a removable device named CYBER_<Revision>.
    If not:
    • Unplug USB and battery, then reconnect
    • Double-tap the reset button to enter bootloader mode