Wireless Network its not working

In Ubuntu Gutsy, ubuntu detects my broadcom wireless card and download the firmware using bcm43xx-fwcutter, then the wireless work perfect.
Now in Ubuntu Hardy beta, ubuntu does the same but the wireless card can not detect any access point.
some usefull information:

root@jair-laptop:/home/jair# iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

wmaster0 no wireless extensions.

wlan0 IEEE 802.11g ESSID:"XXXXXXXXXXXXX"
          Mode:Managed Channel:0 Access Point: Not-Associated
          Tx-Power=0 dBm
          Retry min limit:7 RTS thr:off Fragment thr=2346 B
          Encryption key:XXXX-XX-XX
          Link Quality:0 Signal level:0 Noise level:0
          Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
          Tx excessive retries:0 Invalid misc:0 Missed beacon:0

#In Gutsy, wmaster0 does not exist and wlan0 is called "eth1"

root@jair-laptop:/home/jair# iwlist wlan0 scan
wlan0 Interface doesn't support scanning : Network is down

root@jair-laptop:/home/jair# dhclient
There is already a pid file /var/run/dhclient.pid with pid 7698
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.0.6
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

wmaster0: unknown hardware address type 801
SIOCSIFFLAGS: No such file or directory
SIOCSIFFLAGS: No such file or directory
SIOCSIFFLAGS: Operation not supported
SIOCSIFFLAGS: Operation not supported
wmaster0: unknown hardware address type 801
Listening on LPF/wlan0/00:19:7e:aa:37:89
Sending on LPF/wlan0/00:19:7e:aa:37:89
Listening on LPF/wmaster0/
Sending on LPF/wmaster0/
Listening on LPF/eth0/00:16:d4:e1:45:6d
Sending on LPF/eth0/00:16:d4:e1:45:6d
Sending on Socket/fallback
receive_packet failed on wlan0: Network is down
receive_packet failed on wmaster0: Network is down
DHCPDISCOVER on wmaster0 to 255.255.255.255 port 67 interval 6
send_packet: Network is down
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 5
send_packet: Network is down
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 192.168.1.254
bound to 192.168.1.64 -- renewal in 36166 seconds.

root@jair-laptop:/home/jair# lsb_release -rd
Description: Ubuntu hardy (development branch)
Release: 8.04

root@jair-laptop:/home/jair# uname -a
Linux jair-laptop 2.6.24-12-generic #1 SMP Wed Mar 12 23:01:54 UTC 2008 i686 GNU/Linux

root@jair-laptop:/home/jair# lspci
00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02)
00:1c.2 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 3 (rev 02)
00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA AHCI Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 02)
04:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5787M Gigabit Ethernet PCI Express (rev 02)
05:00.0 Network controller: Broadcom Corporation BCM94311MCG wlan mini-PCI (rev 01)
06:00.0 FLASH memory: ENE Technology Inc ENE PCI Memory Stick Card Reader Controller
06:00.1 SD Host controller: ENE Technology Inc ENE PCI SmartMedia / xD Card Reader Controller
06:00.2 FLASH memory: ENE Technology Inc Unknown device 0720
06:00.3 FLASH memory: ENE Technology Inc ENE PCI Secure Digital / MMC Card Reader Controller

05:00.0 Network controller: Broadcom Corporation BCM94311MCG wlan mini-PCI (rev 01)

I am usig a Acer Aspire 5710z