Alienware M18 xR2 (Bios A12) & Gtx 980M

Hi, since I have an Alienware M18 XR2 with Bios A12 original unmodified and I wanted to install a Gtx 980m that I already have
I was wondering if I need to update the Bios or can I install the Gtx 980m in the slot and then install the drivers?
I ask because I have read that in many cases the Bios must be unlocked … and I wouldn’t know how to do it
Thanks in advance for the help ,-)
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