How to modify FritzBox Fon WLAN 7140 annex B to annex A

[voipuser.int]

Hello everybody,

this is my first message to this great forum, and I am sorry it can only be in English as I do not speak German.
I would to buy on ebay.de this modem but since every german model is annex B it cannot work in Denmark, where only annex A works.
The AVM.de said that annex A modem have a different hardware, but I've read that I can patch to annex A an adapter born annex B.
Is it true? On every 7140? How?
Her in Denmark i ned ADSL , When can i get ADSL to work ?

Thanks
Rafiq
Copenhagen/ Denmark