El uso de Heimdall v1.4 RC1 para flash Clockworkmod Recovery en el Samsung S4, me sale el siguiente,
$ sudo heimdall flash --RECOVERY ./recovery.img --no-reboot
Heimdall v1.4 RC1
Copyright (c) 2010-2012, Benjamin Dobell, Glass Echidna
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This software is provided free of charge. Copying and redistribution is
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Initialising connection...
Detecting device...
Claiming interface...
Attempt failed. Detaching driver...
Claiming interface again...
Setting up interface...
Checking if protocol is initialised...
Protocol is not initialised.
Initialising protocol...
Protocol initialisation successful.
Beginning session...
Session begun.
In certain situations this device may take up to 2 minutes to respond.
Please be patient!
Downloading device's PIT file...
PIT file download successful.
Uploading RECOVERY
100%
ERROR: Failed to confirm end of file transfer sequence!
ERROR: RECOVERY upload failed!
Ending session...
Releasing device interface...
Re-attaching kernel driver...
Incluso he probado con dos diferentes versiones de Clockworkmod,
-rw-rw-r-- 1 ecarroll ecarroll 6.8M Aug 11 23:23 clockworkmod_6.0.3.2_jfltespr.img
-rw-rw-r-- 1 ecarroll ecarroll 6.8M Aug 12 00:02 recovery-clockwork-6.0.3.2-jfltespr.img
$ md5sum *clock*
c95fac4d0e27fcb0c3355f209e62cd9c clockworkmod_6.0.3.2_jfltespr.img
760cbf5a3b157ab23f49fcf40b46db2f recovery-clockwork-6.0.3.2-jfltespr.img
