When trying to flash a Galaxy S3 (ATT), I get
ERROR: Failed to detect compatible download-mode device.
below is the log,
$ sudo heimdall flash --RECOVERY recovery.img
Heimdall v1.4.0
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Initialising connection...
Detecting device...
ERROR: Failed to detect compatible download-mode device.
sudobefore the heimdall command. Well this would fix the error of course. Maybe you want to point that little fact out in your answer. – Flow Aug 14 '13 at 22:35adb reboot downloadgives "error: device not found" for me. – Geremia Apr 03 '15 at 08:33