SAM-BA operation failed

[o7-machinehum]

Hey! I'm trying to flash an Arduino Nano BLE.

machinehum@walkers-MacBook-Pro bike-daq.git % /opt/homebrew/bin/bossac -p /dev/cu.usbmodem21101 -R -e -w -v -b /Users/machinehum/prj/bike-daq/bike-daq.git/build/zephyr/zephyr.bin

SAM-BA operation failed

I couldn't figure out how to get the version out of the cli but here's the help output

machinehum@walkers-MacBook-Pro bike-daq.git % bossac -h
Usage: bossac [OPTION...] [FILE]
Basic Open Source SAM-BA Application (BOSSA) Version 
Flash programmer for Atmel SAM devices.
Copyright (c) 2011-2018 ShumaTech (http://www.shumatech.com)

Examples:
  bossac -e -w -v -b image.bin   # Erase flash, write flash with image.bin,
                                 # verify the write, and set boot from flash
  bossac -r0x10000 image.bin     # Read 64KB from flash and store in image.bin

Options:
  -e, --erase           erase the entire flash starting at the offset
  -w, --write           write FILE to the flash; accelerated when
                        combined with erase option
  -r, --read[=SIZE]     read SIZE from flash and store in FILE;
                        read entire flash if SIZE not specified
  -v, --verify          verify FILE matches flash contents
  -o, --offset=OFFSET   start erase/write/read/verify operation at flash OFFSET;
                        OFFSET must be aligned to a flash page boundary
  -p, --port=PORT       use serial PORT to communicate to device;
                        default behavior is to use first serial port
  -b, --boot[=BOOL]     boot from ROM if BOOL is 0;
                        boot from FLASH if BOOL is 1 [default];
                        option is ignored on unsupported devices
  -c, --bod[=BOOL]      no brownout detection if BOOL is 0;
                        brownout detection is on if BOOL is 1 [default]
  -t, --bor[=BOOL]      no brownout reset if BOOL is 0;
                        brownout reset is on if BOOL is 1 [default]
  -l, --lock[=REGION]   lock the flash REGION as a comma-separated list;
                        lock all if not given [default]
  -u, --unlock[=REGION] unlock the flash REGION as a comma-separated list;
                        unlock all if not given [default]
  -s, --security        set the flash security flag
  -i, --info            display device information
  -d, --debug           print debug messages
  -h, --help            display this help text
  -U, --usb-port[=BOOL] force serial port detection to USB if BOOL is 1 [default]
                        or to RS-232 if BOOL is 0
  -R, --reset           reset CPU (if supported)
  -a, --arduino-erase   erase and reset via Arduino 1200 baud hack

Report bugs to <bugs@shumatech.com>

I'm on a Macbook Pro 2022 (M2 silicon) and installed with brew.

machinehum@walkers-MacBook-Pro bike-daq.git % brew info bossa
Warning: Treating bossa as a formula. For the cask, use homebrew/cask/bossa
==> bossa: stable 1.9.1 (bottled), HEAD
Flash utility for Atmel SAM microcontrollers
https://github.com/shumatech/BOSSA
/opt/homebrew/Cellar/bossa/1.9.1 (6 files, 290.8KB) *
  Poured from bottle using the formulae.brew.sh API on 2023-06-05 at 11:04:07
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/bossa.rb
License: BSD-3-Clause
==> Options
--HEAD
	Install HEAD version
==> Analytics
install: 0 (30 days), 0 (90 days), 56 (365 days)
install-on-request: 0 (30 days), 0 (90 days), 57 (365 days)
build-error: 0 (30 days)