From one of my mailing lists:

** Platinum Speeds Up ** -- Global Village Communication is now selling
TelePort Platinum modems offering connection speeds up to 33.6 Kbps using
the V.34+ ITU standard. For North American owners of previous models of
TelePort Platinum, the company is offering a free firmware updater utility
that will turn most Global Village desktop 28.8 modems into 33.6 modems.
International modems, Performa bundle modems, Comm Slot modems, and
PowerPort modems can't be upgraded using this tool and may be damaged by
improper attempts. [MHA]

http://www.globalvillage.com/support/swlocator/firmwareupdates.html