This problem was related to a wrong firmware.
I know of two different Icarus Illumia E653 devices, one with carta screen and one with pearl screen. Flashing the carta ROM on the pearl device and vice versa is creating touchscreen problems. The ROM from FOV I saw is for the pearl device.
But flashing the wrong FOV ROM shouldn't be a problem, since ADB and Root are activated in the ROM. So booting into bootloader( adb reboot-bootloader ) should work in case something goes wrong and you don't know the key combination on the device to boot in bootloader mode.
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