AirPort Extreme only N can't connect

Hi!

I bought AirPort Extreme (model: MD031RS/A) in Russia a week ago.

I was setup it and it's working fine but now I've trouble.

My home network is macbook pro (2010, 10.7.2), macbook (2008, 10.7.2) and two iphones 4.

I configured my AEBS and selected Radio mode 802.11n only (5Ghz) - 802.11n only (2.4Ghz) and it worked.

Some day ago I can't connect to my mabooks to AEBS - "Could not join "my_network". "A connection timeout occured" but my iphones work good.

Then a rebooted my AEBS, reconfigured.. changed redio mode, radio channels, country, transmit power, and other options. And I saw my macbooks can connect only when AEBS works on radio mode not N protocol.

Also I changed AEBS firmware from 7.6 to 7.5.2 and back..

I don't have idea. My be it's hardware or firmware problems..

Also I have Airport Express (2008 with support 802.11N) and it works fine alway, more than two years.

Then I tried to troubleshooting.

1)

In console I recived messages:

kernel: MacAuthEvent en1 Auth result for: MY_AEBS_MAC MAC AUTH succeeded

kernel: MacAuthEvent en1 Auth result for: MY_AEBS_MAC MAC AUTH succeeded

kernel: MacAuthEvent en1 Auth result for: MY_AEBS_MAC MAC AUTH succeeded

kernel: MacAuthEvent en1 Auth result for: MY_AEBS_MAC MAC AUTH succeeded

kernel: MacAuthEvent en1 Auth result for: MY_AEBS_MAC MAC AUTH succeeded

And I recived a message: "Could not join "my_network". "A connection timeout occured"

but if the connection goes well then

kernel: MacAuthEvent en1 Auth result for: MY_AEBS_MAC MAC AUTH succeeded

kernel: wlEvent: en1 en1 Link UP

kernel: AirPort: Link Up on en1

2) sudo /usr/libexec/airportd logger

Mon Dec 26 23:04:26.2 <airportd[833]> userOnConsole: user: user

Mon Dec 26 23:04:26.2 <airportd[833]> _doAssociate: network: “b”, systemMode: 1, userOnConsole: 1

Mon Dec 26 23:04:26.18 <airportd[833]> _doAssociate: Successfully pulled the password from the keychain. Now trying to associate.

Mon Dec 26 23:04:26.90 <airportd[833]> _handleNewMessage: Received XPC message, event = ASSOC_EVENT, pid = 833

Mon Dec 26 23:04:26.92 <airportd[833]> associate: INFO: airportd associate: network=<CWNetwork: 0x7f7f84203af0> [ssid=b, bssid=28:cf:da:b8:41:8c, security=WPA2 Personal, rssi=-57, channel=<CWChannel: 0x7f7f84205ae0> [channelNumber=52(5GHz), channelWidth={40MHz(+1)}], ibss=0], is8021X=0, remember=1

Mon Dec 26 23:04:26.104 <airportd[833]> associate: INFO: Checking if admin authorization is required

Mon Dec 26 23:04:26.118 <airportd[833]> preferencesUpdated: Checking if preferences are updated

Mon Dec 26 23:04:26.119 <airportd[833]> preferencesUpdated: Preferences are updated, version = 10

Mon Dec 26 23:04:26.258 <kernel> parseRSNIE: groupCipherType = 5 pairwiseCipherType = 5 authSel = 2

Mon Dec 26 23:04:26.258 <kernel> initWithInterfaceAndIE: _myMacAddress c8:bc:c8:d8:87:bc

Mon Dec 26 23:04:26.258 <kernel> setPMK: PMK SET!

Mon Dec 26 23:04:26.258 <kernel> Searching for networks with ssid b

Mon Dec 26 23:04:26.273 <kernel> Association to 28:cf:da:b8:41:8c Failed with status 1

Mon Dec 26 23:04:26.273 <kernel> Searching for networks with ssid b

Mon Dec 26 23:04:29.33 <kernel> Association to 28:cf:da:b8:41:8c Failed with status 1

Mon Dec 26 23:04:29.53 <kernel> en1: Terminating supplicant.

Mon Dec 26 23:04:29.53 <kernel> RSNSupplicant: Releasing authenticator for 00:00:00:00:00:00

Mon Dec 26 23:04:29.53 <airportd[833]> associate: Apple80211Associate2() failed with error -3926

Mon Dec 26 23:04:29.54 <airportd[833]> _doAssociate: assocError (-3926) = Error Domain=com.apple.coreWLAN.error Code=-3926 "Station does not support required 802.11n features" UserInfo=0x10682f2a0 {NSLocalizedDescription=Station does not support required 802.11n features}

Mon Dec 26 23:04:29.55 <airportd[833]> matchAndJoinNetworkListAgainstScanResults: unsuccessful assocation to “b”

Mon Dec 26 23:06:30.997 <airportd[876]> _processSystemPSKAssoc: No password for network <CWNetwork: 0x7fa0d3903f80> [ssid=b, bssid=28:cf:da:b8:41:8c, security=WPA2 Personal, rssi=-60, channel=<CWChannel: 0x7fa0d3b02b80> [channelNumber=52(5GHz), channelWidth={40MHz(+1)}], ibss=0] in the system keychain

Mon Dec 26 23:06:38.67 <airportd[876]> _handleNewMessage: Received XPC message, event = ASSOC_EVENT, pid = 310

Mon Dec 26 23:06:38.69 <airportd[876]> associate: INFO: airportd associate: network=<CWNetwork: 0x7fa0d3913450> [ssid=b, bssid=28:cf:da:b8:41:8c, security=WPA2 Personal, rssi=-60, channel=<CWChannel: 0x7fa0d3903160> [channelNumber=52(5GHz), channelWidth={40MHz(+1)}], ibss=0], is8021X=0, remember=1

Mon Dec 26 23:06:38.82 <airportd[876]> associate: INFO: Checking if admin authorization is required

Mon Dec 26 23:06:38.98 <airportd[876]> preferencesUpdated: Checking if preferences are updated

Mon Dec 26 23:06:38.98 <airportd[876]> preferencesUpdated: Preferences are updated, version = 10

Mon Dec 26 23:06:38.110 <kernel> parseRSNIE: groupCipherType = 5 pairwiseCipherType = 5 authSel = 2

Mon Dec 26 23:06:38.111 <kernel> initWithInterfaceAndIE: _myMacAddress c8:bc:c8:d8:87:bc

Mon Dec 26 23:06:38.111 <kernel> setPMK: PMK SET!

Mon Dec 26 23:06:38.111 <kernel> Searching for networks with ssid b

Mon Dec 26 23:06:38.326 <kernel> Association to 28:cf:da:b8:41:8c Failed with status 1

Mon Dec 26 23:06:38.326 <kernel> Searching for networks with ssid b

Mon Dec 26 23:06:41.79 <kernel> Association to 28:cf:da:b8:41:8c Failed with status 1

Mon Dec 26 23:06:41.99 <kernel> en1: Terminating supplicant.

Mon Dec 26 23:06:41.99 <kernel> RSNSupplicant: Releasing authenticator for 00:00:00:00:00:00

Mon Dec 26 23:06:41.99 <airportd[876]> associate: Apple80211Associate2() failed with error -3926

or

Mon Dec 26 00:19:22.436 <airportd[471]> associate: Apple80211Associate2() failed with error -3905

but if the connection goes well then

Mon Dec 26 23:11:04.328 <airportd[917]> associate: INFO: airportd associate: network=<CWNetwork: 0x7f9ad1d067d0> [ssid=b, bssid=28:cf:da:b8:41:8c, security=WPA2 Personal, rssi=-57, channel=<CWChannel: 0x7f9ad1d08500> [channelNumber=100(5GHz), channelWidth={40MHz(+1)}, DFS], ibss=0], is8021X=0, remember=1

Mon Dec 26 23:11:04.344 <airportd[917]> associate: INFO: Checking if admin authorization is required

Mon Dec 26 23:11:04.370 <airportd[917]> preferencesUpdated: Checking if preferences are updated

Mon Dec 26 23:11:04.370 <airportd[917]> preferencesUpdated: Preferences are updated, version = 10

Mon Dec 26 23:11:04.528 <kernel> parseRSNIE: groupCipherType = 5 pairwiseCipherType = 5 authSel = 2

Mon Dec 26 23:11:04.528 <kernel> initWithInterfaceAndIE: _myMacAddress c8:bc:c8:d8:87:bc

Mon Dec 26 23:11:04.528 <kernel> setPMK: PMK SET!

Mon Dec 26 23:11:04.528 <kernel> Searching for networks with ssid b

Mon Dec 26 23:11:04.531 <configd[16]> _bsd_80211_event_callback: LINK_CHANGED (en1)

Mon Dec 26 23:11:04.532 <configd[16]> _p2pSupEventCallback: APPLE80211_M_LINK_CHANGED

Mon Dec 26 23:11:04.533 <configd[16]> _p2pSupEventCallback: Primary interface link marked up

Mon Dec 26 23:11:04.533 <configd[16]> _p2pSupEventCallback: New channel = 100 (flags=0x314)

Mon Dec 26 23:11:04.533 <configd[16]> _p2pSupEventCallback: APPLE80211_M_BSSID_CHANGED

Mon Dec 26 23:11:04.533 <airportd[917]> _handleNewMessage: Received XPC message, event = DRIVER_EVENT, pid = 16

Mon Dec 26 23:11:04.533 <airportd[917]> _processDriverEvent: link changed