How to update javacard applet

[wousim]

As I know, there is no command to update an applet on the card w/o deleting it. Does anybody know how to do this?
I do need this to update an applet on the card which is already given to customer. Hope you can help me out! Thanks in advance.

[pitbar]

The only way to do this is to delete and reinstall the applet.

[wousim]

The only way to do this is to delete and reinstall the applet.

Thanks for you answer!
But is it feasible to modify the card operating system in order to update the applet?

[pitbar]

I think there is no card provider that can allow this.

[mabel]

You can export data on the card first and then delete, and install the applet. Finally, import the data again.

[popmun09]

Firstly, it's very hard to let your card vendor help you do this.

You can define an applet that stores data and a SIO that you can use to access this applet. The business logic goes into another applet and calls the methods on the interface to get or set data in the other applet. Your business logic can be deleted and reinstalled without affecting data.