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BCM4312 Wifi Not Scanning Any Network

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I have Succesfully Installed Yosemite On my Dell inspiron 5520.


My Specs :-

Intel Core i5 2.49 GHz


AMD Radeon 7670M (Not Working),Intel HD Graphics 4000(Working).

Realtek RTL 8139 Eithernet(Working)


My problem is WiFi.WiFi icon is showing but the problem is when i try to scan any network nothing shows up.


i used DPCIManager and it shows:-

Vendor id-14E4

Device id-4315

vendor name-Broadcom

Device name-BCM4312 802.11b/g LP-PHY





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