I found this question on GitHub: https://github.com/Androxyde/devices/issues/53 in which someone asks why he cannot flash the F5121 with Androxyde. He states he did manage with an earlier version: "I only flash successfully with an older version F5121_34.0.A.2.301 using 34.0.fsc script." So it seems I had the wrong ftf to flash with. I will have another go with this version: https://easy-firmware.com/index.php?...egory&id=18692, at the bottom.