[REQUEST] ThinkPad T420 Wifi Card whitelist removal

ThinkPad T420
Model: 4177 CTO
BIOS: 83ET76WW (1.46)
BIOS link: http://support.lenovo.com/en_US/download...D=DS018785

Present WWAN card: Gobi3000
Present wifi card: Intel N-6250

Wifi card to be installed: Atheros AR5BHB92

I installed bios mod:
Lenovo_ThinkPad_T420_83ET76WW-83uj28us_NWL in thread:
http://www.bios-mods.com/forum/Thread-RE...2#pid60462

but when i replace Intel N - 6250 by wifi Atheros AR5BHB92, system error: 1802 unauthorized network card is plugged in - power off and remove the mini pci network card

Please help me. Thanks very much!