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I am trying to flash TWRP on Samsung Galaxy S6 that I inherited from someone else, there was already some custom software on it, but I am not sure what exactly. File transfer to a computer works fine. The computer I am using has ubuntu 16.04 installed and heimdall from the official repositories v1.4.1) and the following works fine on an S4 mini:

$ heimdall print-pit
Heimdall v1.4.1

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Initialising connection...
Detecting device...
libusb: error [_get_usbfs_fd] libusb couldn't open USB device /dev/bus/usb/001/018: Input/output error
ERROR: Failed to access device. libusb error: -1
  • Try to run heimdall as root. sudo heimdall whatevercommands – Reddy Lutonadio Apr 7 '19 at 10:39
  • already tried, did not work. I just made it work by switching to LXDE, it was probably missing a library and I am not sure why it did work on the s4 mini – gdkrmr Apr 7 '19 at 10:45
  • Good that you found a solution. Answer the question for others who may have the same problem in the future. – Reddy Lutonadio Apr 7 '19 at 10:46
  • it just stopped working... not sure why. I set up the permissions for adb to work without sudo some time ago, I have to recheck, maybe I have add some rules. – gdkrmr Apr 7 '19 at 10:51
  • Does this command work? sudo chmod o+w -R /dev/bus/usb/whatevernumber. Also remove udev restrictions. – Reddy Lutonadio Apr 7 '19 at 10:57
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The problem must have been on the side of the s6. I was able to run heimdall print-pit successfully, but only for a moment after entering download mode.

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