Today I published a new version of the installer app (2.5.9). It supports additional newer or 64 bit phones. On these phones a special "factory test mode" must be set to create the necessary file in the baseband's file system. Additionally the phone must be rebooted after setting the test mode.
Some phones don't remember the test mode after the reboot, so you still cannot make the change to the baseband settings. The Oneplus Two is affected by this problem. I'll keep trying to find a solution for these phones.
I could enable rSAP on a ZTE Nubia Z9 mini. It needs the reconnect plugin to properly work. I don't know if this happens on all 64 bit phones or only on the Nubia. So please give feedback.