How to backup stockRom S5 before starting to follow any instructions to root + flash + LineageOS ...
What I want:
* backup my brand new stock ROM Galaxy S5 SM-G900F
* before I even start with TWRP, root, etc.
* with an apk, via USB on a PC ... any way that would work
* or if total backup does not exist, then at least the EFS partitions?
because:
* I might want to sell it later
* I might have to send it back
* flashing TWRP & LineageOS might fail
* I have lost mobileInternet on an LG-V20 already because something went strange when flashing
* I am careful
Is there any way to backup a Samsung S5 before I even start with following any instructions here?
Am I asking for something impossible?
Was I on the right way already (see below), but have done something wrong?
Is it perhaps only possible after rooting? If so, then which tool do you recommend then?
Thanks a lot!

What I have tried:
* xda developer galaxy-s5/general every thread title until page 5 https://forum.xda-developers.com/galaxy-s5/general/page5
* xda developer search for "S5 backup", "S5 EFS", and a few other searches. Sorry for being dumb, please help me search, thanks.
* Heimdall PIT, but "ERROR: Failed to send request to end PIT file transfer!"
* Odin PIT, but "Can't open the specified file. (Line: 1892)"
* Samsung Tool 5.0 com.sec.ricky310711.samsungtool.apk https://forum.xda-developers.com/showthread.php?t=2696153 but the app-->Backup-EFS hangs at "Please Wait..." <-- probably because I could not install busybox because no root yet.
* manual EFS backup with dd https://forum.xda-developers.com/showthread.php?t=2737448 but I get a "su: not found", obviously, because unrooted
What I want:
* backup my brand new stock ROM Galaxy S5 SM-G900F
* before I even start with TWRP, root, etc.
* with an apk, via USB on a PC ... any way that would work
* or if total backup does not exist, then at least the EFS partitions?
because:
* I might want to sell it later
* I might have to send it back
* flashing TWRP & LineageOS might fail
* I have lost mobileInternet on an LG-V20 already because something went strange when flashing
* I am careful
Is there any way to backup a Samsung S5 before I even start with following any instructions here?
Am I asking for something impossible?
Was I on the right way already (see below), but have done something wrong?
Is it perhaps only possible after rooting? If so, then which tool do you recommend then?
Thanks a lot!
What I have tried:
* xda developer galaxy-s5/general every thread title until page 5 https://forum.xda-developers.com/galaxy-s5/general/page5
* xda developer search for "S5 backup", "S5 EFS", and a few other searches. Sorry for being dumb, please help me search, thanks.
* Heimdall PIT, but "ERROR: Failed to send request to end PIT file transfer!"
* Odin PIT, but "Can't open the specified file. (Line: 1892)"
* Samsung Tool 5.0 com.sec.ricky310711.samsungtool.apk https://forum.xda-developers.com/showthread.php?t=2696153 but the app-->Backup-EFS hangs at "Please Wait..." <-- probably because I could not install busybox because no root yet.
* manual EFS backup with dd https://forum.xda-developers.com/showthread.php?t=2737448 but I get a "su: not found", obviously, because unrooted
Code:
Heimdall v1.4.0
...
Initialising connection...
Detecting device...
Claiming interface...
Setting up interface...
Initialising protocol...
Protocol initialisation successful.
Beginning session...
Some devices may take up to 2 minutes to respond.
Please be patient!
Session begun.
Downloading device's PIT file...
ERROR: Failed to send request to end PIT file transfer!
ERROR: Failed to download PIT file!
Ending session...
ERROR: Failed to send end session packet!
Releasing device interface...
Code:
<ID:0/003> Added!!
<ID:0/003> Odin engine v(ID:3.1301)..
<ID:0/003> File analysis..
<ID:0/003> Total Binary size: 0 M
<ID:0/003> SetupConnection..
<ID:0/003> Initialzation..
<ID:0/003> Set PIT file..
<ID:0/003> DO NOT TURN OFF TARGET!!
<ID:0/003> Can't open the specified file. (Line: 1892)
<OSM> All threads completed. (succeed 0 / failed 1)
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