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Fix for Dell Inspiron 1545 Broadcom BCM4312

This is an update of sorts to this question here

The wifi on this machine worked fine using the broadcom-wl package on fedora 20 Now upgraded to Fedora 22 and wifi no longer works

$lspci -knn | grep Broadcom 0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01) Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c] Kernel modules: wl

$modprobe wl -v insmod /lib/modules/4.0.4-301.fc22.x86_64/extra/wl/wl.ko modprobe: ERROR: could not insert 'wl': Operation not permitted

dmesg | grep wl [29.934107] wl: module license 'MIXED/Proprietary' taints kernel. [29.041554] wl: module verification failed: signature and/or required key missing - tainting kernel ...

I think it might be something to do with a secure module kernel parameter

But not sure how to disable this feature?