Short recap: GalaxyTab 10.1, the fake iPad, illegal in Europe, no USB-mass storage, must use kies (not known to work on any platform), libmtp not working. So while Apple and Samsung go patent nuclear, I solved my “easy” problem of transfering a file to that tablet (using Gentoo, or just anything which has a command line). My earlier solution was undone by a software upgrade that Samsung pushed over the air. The new solution that I found now is so simple that I cannot believe not finding it earlier. Just use the adb debugging tool. Isn’t it completely obvious that this is the way to go? Well, you need to get the adb tool which is not included in the android-sdk anymore, but easy to find on the web. If you unlocked your phone to install cyanogenmod, then you may still have it around. The command is adb push with a quite obvious syntax. Remember that you need to put your device into USB-debugging mode via the settings, otherwise adb won’t connect. If you copy files to a non-system folder, like /sdcard/Downloads then no rooting is needed. Transfer speed is decent at about 1300kb/s on USB 2.0.