Need to run macbook pro in 32 bit mode to run and external modem how do i change from 64 bit to 32 bit

I have a macbook pro which i presume runs in a 64 bit mode. living in a country without broadband i need to use a 32 bit modem, can i change the system to run this modem at 32 bit as it wont load at 64?

Reboot holding 3 and 2, see if your modem works.
Rebooting again sets it back to 64 bit.
If 32 bit works then your fine, for now, but eventually your going to have to go 64 bit.

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