Airport Extreme Card won't run 802.11n

I have an AirPort Extreme card (0x14E4, 0x90) Firmware Version: Broadcom BCM43xx 1.0 (5.10.131.36.1) in a MacMini Intel Core 2 Duo 3,1.
Using a Billion 7404VNPX wireless router, the card will only run on 802.11g.
At the same time, I've fitted a 3rd party wireless g/n card to an ancient PowerMac G4, and it runs perfectly happily on 802.11n
Can someone suggest how to make the card do what it's supposed to do?

William Boyd, Jr. wrote:
Sorry, but that card can only run 802.11b/g, so it really is doing just what it's supposed to.
Well, if that's the case, perhaps Apple should improve the System Profiler reporting. Here's what mine reports for this card:
en1:
Card Type: AirPort Extreme (0x14E4, 0x90)
Firmware Version: Broadcom BCM43xx 1.0 (5.10.131.36.1)
Locale: APAC
Country Code: X1
Supported PHY Modes: 802.11 a/b/g/n
Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 149, 153, 157, 161, 165
Wake On Wireless: Supported
Status: Connected
Hmmm....wonder if I can get a refund or replacement?

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