Can't connect Buffalo WHR-G300N router as N mode in MBP mid 2010

Supported mode ares only a/b/g in system profiler though on the package says Built-in AirPort Extreme wireless networking (802.11n). So it can't be connected Buffalo WHR-G300N router as N mode beside Window7 on Boot Camp is working in N mode.

Software Versions:

Menu Extra: 6.2.1 (621.1)

configd plug-in: 6.2.4 (624.2)

System Profiler: 6.0 (600.9)

Network Preference: 6.2.1 (621.1)

AirPort Utility: 5.5.2 (552.11)

IO80211 Family: 3.1.4 (314.1.1)

Interfaces:

en1:

Card Type: AirPort Extreme (0x14E4, 0x8D)

Firmware Version: Broadcom BCM43xx 1.0 (5.10.131.36.9)

Locale: APAC

Country Code: RU

Supported PHY Modes: 802.11 a/b/g

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

Current Network Information:

ID13:

PHY Mode: 802.11g

BSSID: 0:24:a5:bc:9d:20

Channel: 8

Network Type: Infrastructure

Security: WPA Personal

Signal / Noise: -48 dBm / -92 dBm

Transmit Rate: 54