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
Copyright (c) 2010-2013, Benjamin Dobell, Glass Echidna
http://www.glassechidna.com.au/
This software is provided free of charge. Copying and redistribution is
encouraged.
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Initialising connection...
Detecting device...
ERROR: Failed to detect compatible download-mode device.