[MichaelNRW]

A Standalone ISTA will never be able to send any information to BMW. The data inside your DME is evalued by ISTA to determine if the DME has been tuned, so you get that S0777 code, which is not a DTC code stored in the DME but an ‘information’ generated by ISTA.
Then there is another step which requires to dump some data from the DME and send it to BMW for further analisys.
Of course you will never dump this data from your car, and even if you dump it it will remain in your Rheingold folder, so you can scan your car multiple times with a Standalone ISTA and no one will ever know.
However, as soon as you go to the dealership and they scan the car with their ISTA, they (and BMW) will know anyway…
As far as I am concerned, ISTA 4.34 was the first to automatically pop up the S0777 code when scanning a tuned car. The tuning detection routine was implemented way before the 4.34 but was less effective somehow.

Thank you for clarification.
It´s clear that my ISTA can´t send anythign to BMW and that wasn´t my question
Good to know that S0777 is just an information in ISTA and will not be written back to the car as a DTC.

So i can savely run ISTA to determine if the FEMto unlock alone triggers S0777 without the result of the tuning detection being written back into the car as DTC.

Until now my dealer always asked me if they need to read the DTCs and i always say no.
I would assume they run the small identification without reading DTCs before the task (e.g. oil change)
Is the tuning detection only part of the full identification or already part of the small one?