Following the steps described here…
… I tried to manually update Android on my FP2.
The script does not show any errors, it keeps running, and looking at the Linux process I can see that fastboot uses 3 to 4% of CPU and is still active.
But the description on the page linked above tells me
the process will be over in a couple of minutes
so I ask myself after one hour of waiting: How many more minutes to go? 
Can anyone help?
does fastboot devices provide any output?
$ sudo fastboot devices
[…]
fed2f60d fastboot
are you running the updater as root as well?
No, the instruction didn’t say that. And now I don’t want to stop the running process because this could break the phone (I think).
What’s the last output of flash-for-unix.sh?
Just before it starts sending data, it should say ‘Proceeding to flash the device.’.
$ sh flash-for-unix.sh
** Fairphone OS 17.09.3 Manual Flashing Script **
Validating files…
Validation complete.
That’s all.
In that case I don’t think it has touched the device yet. It should be safe to stop the script.
It may work better running as root - try fastboot devices without root to see if that throws an error. I think the error handling in the script hasn’t been properly designed to detect permissions errors.
Yes, fastboot devices throws a permission error. That’s why I used sudo.
But you are sure, it is no problem to stop the script while Fastboot still uses CPU?
Okay, I tried sudo sh flash-for-unix.sh and now the script continues. 
@staff: Who can change the instruction?
Glad it worked out, sorry for not answering the question about CPU usage - I was away from my computer for a while.
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