Okay. Because I have already done it but in some paying airports the passengers keep walking out of Jetways
Please clarify what do you mean with "walking out of Jetways".
If they are just sticking out of it, because the jetway is either too low or too high, that's a completely different issue that doesn't have anything to do with SU12, since nothing in the SU12 give any info about the location of the jetway floor or its height, so GSX by default assume a certain height, but you can customized it. This is of course explained in the manual, in the "
Custom Jetway Floor heights" chapter at Page 71.
If, instead, the scenery you are referring to has non-standard jetways, like the T-shaped ones that moves only in one direction, that's not something really supported by the SU12 API, which assumes a jetway made like the default one so, some developers have devised creative ways to make it work, the info we get from the API is not enough, you can find these at ENBR, for example. To support these jetways, it will be required extra customization on the GSX airport profile, and will be included in the next update.
If, instead, the jetways looks standard, you are sure you have update GSX and you still have passengers taking completely wrong routes, it's likely your problem has been caused by Simconnect being too overloaded by other add-ons, most likely AI Traffic products that inject too many AI, exceeding the maximum number of objects in the simulation, which results GSX just not getting the data it needs from the simulator, because Simconnect communication became erratic.
So, please clarify exactly what's your case and where this happens.