@bearer Will do!

Looks like it's a bug in the macOS/BSD version of Bossa. Dug up an old pc and it flashes fine with the Windows version. Thanks for the assistance.

@Danal I should've mentioned this running standalone

@bearer It fails at different points with different versions of firmware. I assume 0x400e0c08 is some register that contains the result of whatever operation its trying to perform.

Duet3 MB6HC 1.0 (3.0beta12)

I received this board and out of box everything worked until I attempted to flash it over ethernet via DWC. The board stopped responding over ethernet and USB (I read earlier that the ethernet is unreliable in 3.0 beta).

I followed steps for flashing board using Bossa 1.9.1 but it always returns 'Flash failed' at 6%.

1. Reboot with Erase jumper installed.
2. Remove Erase jumper.
3. Attempt to flash with Bossa either through UI or command line fails.

$ sudo bossac -e -w -v -b -d -U -p cu.usbmodem144201 ./Duet3Firmware_MB6HC.bin -R
...
go(addr=0x20401020)
writeWord(addr=0x400e0c04,value=0x5a004301)
[= ] 6% (68/1110 pages)write(addr=0x20401034,size=0x200)
writeWord(addr=0x20401028,value=0x408800)
writeWord(addr=0x2040102c,value=0x20401034)
readWord(addr=0x400e0c08)=0x469c4662

Flash command failed

Any ideas? Verify also fails, but read succeeds.