I have just the same problem with my S5, download mode without any problem but I'm unable to reinstall OS because computer won't connect with the phone...
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I have just the same problem with my S5, download mode without any problem but I'm unable to reinstall OS because computer won't connect with the phone, I go this message when trying to restore with Heimdall:
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Initialising connection...
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Detecting device...
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ERROR: Failed to detect compatible download-mode device.
I have just the same problem with my S5, download mode without any problem but I'm unable to reinstall OS because computer won't connect with the phone...