changing SL5 frequency from european band to south american frequency band

[Destis_Place]

Hello,
How can I change the frequency band in the Openscape SL5 DECT pone from
1.88 - 1.90 MHz to the latin american band of 1.91 - 1.93 MHz ?

At my hipath 3000 I could change it without problems, but the Handset is very special.
I downloaded the latest Firmware from SEBA but no option to change the frequency.

I have to move with the frequency because of an mobile pone provider.
I have about 200 handsets and buying new ones is no option.

Please help me

 

[adibv]

Hello.

Acc. to SL5 DECT phone specifications:
Radio frequency range 1880-1900 MHz.
So I don't think is possible to change the frequency band.