I am trying to root my Cubot Rainbow (Android 7.0) following this tutorial. Everything works fine, I am able to flash partitions with the SP Flash Tool and the recovery is working properly.
The recovery version is TWRP 3.1.0 by Jemmini. However, whenever I try to flash any SuperSU (whatever version from whatever website, including the ones from the tutorial) I always get the same message: status 11... which just means 'try again'.
Does anybody know why this is happening?