Presently, the only way to upgrade your radio is to send it in. This is the present status and hopefully we can have the remote upgrade option working again in the future.
We do realize that this is not practical for some overseas customers and as a token of appreciation for being a Graupner customer we are offering a radio upgrade to the mz-16 or mz-32 as well as Graupner accessories at a 20% discount.
Please note, this offer is only valid for customers outside of the United States.
If this is of interest to you, please contact us so that we can make the proper pricing arrangements.