Hi all,
I’m running into issues flashing an Arduino Nano 33 BLE Rev2 (nRF52840) using Zephyr and the bossac runner. I consistently hit a “Flash erase failed” error and can’t get past it. Please note that I've used ChatGPT to help me format this post but I have verified all information present.
Development Setup
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Host OS: Windows 11
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Tooling:
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westv1.4.0 -
Zephyr v3.1.0
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Toolchain from nRF Connect SDK installation
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Visual Studio Code (Nordic extension installed), but I am invoking
westfrom the command line (PowerShell)
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bossac binary: Arduino-provided build
C:\Users\...\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.9.1-arduino2\bossac.exe
Hardware
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Board: Arduino Nano 33 BLE Rev2
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Target MCU: nRF52840
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Connection: USB, COM4 (bootloader mode confirmed via Device Manager)
Command
west flash --bossac=C:\Users\luke.trusheim_nzxt\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.9.1-arduino2\bossac.exe --bossac-port=COM4
Output
-- west flash: rebuilding
[0/5] Performing build step for 'blinky'
ninja: no work to do.
[4/5] cmd.exe /C "cd /D C:\ncs\v3.1.0\zephyr\samples\basic\blinky\b...sysbuild && C:\ncs\toolchains\b8b84efebd\opt\bin\cmake.exe -E true"
-- west flash: using runner bossac
Write 21856 bytes to flash (6 pages)
[ ] 0% (0/6 pages)
Flash erase failed
FATAL ERROR: command exited with status 1: 'C:\Users\...\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.9.1-arduino2\bossac.exe' -p COM4 -R -w -v -b 'C:\ncs\v3.1.0\zephyr\samples\basic\blinky\build\blinky\zephyr\zephyr.bin'What I’ve Tried / Verified
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Board is definitely in bootloader mode (double-tap reset, correct COM port confirmed).
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Using Arduino’s 1.9.1-arduino2 bossac, not Zephyr SDK’s version.
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west flash --helplistsbossacas a supported runner for this board.
Help please!
At this point I’m stuck. I haven’t been able to get bossac to successfully erase or flash the board. Any help, insights, or suggestions from others who’ve dealt with this issue would be greatly appreciated.
Thanks,
Luke
