it seems that there are only 18GB of disk space available and that the data for system partition is only 2GB. I believe there should be a discussion with sailors about it. sledges , 08:30:15)

it is not possible to repartition the device, hence we lose 7 GB worth of space in the Android's system partition (that we only use for ~1.5 GB factory reset image, which cannot be placed elsewhere) sledges , 08:42:18)

to the brave souls out there: sledges , 08:51:30)