[2013m5]

To program I20 you need to have AOS account or work for BMW dealer.

Here is from the Note:

What's New - Secure Communication

With the introduction of I-stages{22-07-5xx} and following, secure onboard communication is activated by ISTA on the I20 and
U06 vehicles.
This is intended to prevent manipulation during communication between the control units in the vehicle.
The correct ECU validation of the ECUs is a prerequisite for secure onboard communication.
For troubleshooting, the corresponding fault memory entries regarding IPSec and SecOC must be observed.