[Request] WIFI Whitelist removal thinkpad t420s bio ver: 1.41

Unfortunately it appears that lenovo has killed off downgrading from the 1.41 bios version, therefore i can't use previously whitelisted bios versions for my specific model. Humbly requesting for help with whitelist removal. Thanks guys.

Bios Link: https://download.lenovo.com/pccbbs/mobiles/8cuj20us.exe 8CET61WW

Thinkpad t420s 4173-J2M 
Initial default card: Intel Centrino Advanced-N 6205 Model 62205ANHMW

Intended upgrade: Broadcom BCM94322HM8L 

All help will be highly appreciated.
Thanks legends