The actuator needs to be mounted to the top of the turbo so that it can see the hard.stops of the turbo. The actuator has to be mounted to the top of the turbo with the tiny dot on the end of the actuator gear facing just shy of the '270-degree' position + the turbo arm/gear itself sitting in its install position when placing it. Here is also a screen-shot from that box I made of the raw J1939 command that forces it out of that state. The turbo test/calibration box I built for myself by hand will fix this sort of hung-up, dead-stick, refusing-to-calibrate condition. There is a J1939 command that will get it out of this state and force it to calibrate even in this hug state.

Bad battery/ground connections in the truck can cause the turbo actuator to end up in this hung-up, non-responsive state, seen that a few times already. I have not seen/come across an actuator needing its base software re-installed yet, but I have seen on occasion, one that Insite 7.6.2 will not calibrate because it was in a 'hung state' after a failed calibration whenever there was a power glitch/surge in the truck of some sort. I believe Unilevers has mentioned this on here before:

Sometimes actuators are sold that are missing their internal software. If it will not calibrate with good ecm and factory programming, then the turbo actuator itself may be in a hung state or missing its software.

At least make sure it is not bad de-mandate programming holding you up. I would say back up the bad delete program it has in it using C%^term (c a l t e r m), so you have a copy of it then flash the ECM back to factory stock programming that belongs to that engine's specific ser#.

Cummins insite 7.5 calibrations