HP pavillon zd7000 doesn't detect wifi board

I send you more information about the system and the hardware :
02:03.0 Network controller [0280]: Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller [14e4:4320] (rev 03)
 Subsystem: Hewlett-Packard Company Broadcom 802.11b/g WLAN [103c:12f4]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
 Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 32
 Interrupt: pin A routed to IRQ 21
 Region 0: Memory at d2004000 (32-bit, non-prefetchable) [size=8K]
 Kernel driver in use: b43-pci-bridge
 Kernel modules: ssb

davide@davide-Pavilion-zd7000-PB949EA-ABZ:~$ lsb_release -rd
Description: Ubuntu 12.04.5 LTS
Release: 12.04
davide@davide-Pavilion-zd7000-PB949EA-ABZ:~$ uname -a
Linux davide-Pavilion-zd7000-PB949EA-ABZ 3.2.0-67-lowlatency-pae #70-Ubuntu SMP PREEMPT Tue Jul 15 06:33:44 UTC 2014 i686 i686 i386 GNU/Linux
davide@davide-Pavilion-zd7000-PB949EA-ABZ:~$ apt-cache policy firmware-b43-installer
firmware-b43-installer:
  Installato: 1:015-9
  Candidato: 1:015-9
  Tabella versione:
 *** 1:015-9 0
        500 http://archive.ubuntu.com/ubuntu/ precise/multiverse i386 Packages
        100 /var/lib/dpkg/status
davide@davide-Pavilion-zd7000-PB949EA-ABZ:~$ sudo dmidecode -s bios-version
[sudo] password for davide:
F.34
davide@davide-Pavilion-zd7000-PB949EA-ABZ:~$ sudo dmidecode -s bios-release-date
07/12/2004

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: firmware-b43-installer 1:015-9
ProcVersionSignature: Ubuntu 3.2.0-67.70-lowlatency-pae 3.2.60
Uname: Linux 3.2.0-67-lowlatency-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.8
Architecture: i386
Date: Sun Jun 28 08:44:52 2015
InstallationMedia: Ubuntu-Studio 12.04.3 "Precise Pangolin" - Release i386 (20130820)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=it:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: b43-fwcutter
UpgradeStatus: No upgrade log present (probably fresh install)