"Firmware not ready" error with a BCM4311

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http://askubuntu.com – I've installed ubuntu 11.10 on my laptop (Compaq Presario V6000), which has BCM4311 Wireless Adapter, on the installation screen, it was showing firmware not ready in the network menu, but when I installed with install third-party software, the Enable Wireless option completely disappeared in the menu. I am using Wireless Ad-hoc to share my PC's connection, because my ISP doesn't allow more than one computer. So I can't connect via ethernet to download system updates. Any solutions? (HowTos)