All thinkpads have a Wifi card whitelist at the BIOS level that prevent installing certain WiFi cards. The restriction can be bypassed with a BIOS modification: either installing Libreboot, Coreboot or editing the official Lenovo/IBM BIOS.

This model can be externally flashed with Libreboot. Doing so also remove the AMT, MEMT. Instructions can be here: http://www.libreboot.org/docs/install/x200_external.html

$ sudo lspci -vmmnn

Slot:	00:00.0
Class:	Host bridge [0600]
Vendor:	Intel Corporation [8086]
Device:	Mobile 4 Series Chipset Memory Controller Hub [2a40]
SVendor:	Lenovo [17aa]
SDevice:	Device [20e0]
Rev:	07

Slot:	00:02.0
Class:	VGA compatible controller [0300]
Vendor:	Intel Corporation [8086]
Device:	Mobile 4 Series Chipset Integrated Graphics Controller [2a42]
SVendor:	Lenovo [17aa]
SDevice:	Device [20e4]
Rev:	07

Slot:	00:02.1
Class:	Display controller [0380]
Vendor:	Intel Corporation [8086]
Device:	Mobile 4 Series Chipset Integrated Graphics Controller [2a43]
SVendor:	Lenovo [17aa]
SDevice:	Device [20e4]
Rev:	07

Slot:	00:03.0
Class:	Communication controller [0780]
Vendor:	Intel Corporation [8086]
Device:	Mobile 4 Series Chipset MEI Controller [2a44]
SVendor:	Lenovo [17aa]
SDevice:	Device [20e6]
Rev:	07

Slot:	00:19.0
Class:	Ethernet controller [0200]
Vendor:	Intel Corporation [8086]
Device:	82567LF Gigabit Network Connection [10bf]
SVendor:	Lenovo [17aa]
SDevice:	Device [20ee]
Rev:	03

Slot:	00:1a.0
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #4 [2937]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f0]
Rev:	03

Slot:	00:1a.1
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #5 [2938]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f0]
Rev:	03

Slot:	00:1a.2
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #6 [2939]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f0]
Rev:	03

Slot:	00:1a.7
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB2 EHCI Controller #2 [293c]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f1]
Rev:	03
ProgIf:	20

Slot:	00:1b.0
Class:	Audio device [0403]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) HD Audio Controller [293e]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f2]
Rev:	03

Slot:	00:1c.0
Class:	PCI bridge [0604]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) PCI Express Port 1 [2940]
Rev:	03

Slot:	00:1c.1
Class:	PCI bridge [0604]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) PCI Express Port 2 [2942]
Rev:	03

Slot:	00:1c.3
Class:	PCI bridge [0604]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) PCI Express Port 4 [2946]
Rev:	03

Slot:	00:1d.0
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #1 [2934]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f0]
Rev:	03

Slot:	00:1d.1
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #2 [2935]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f0]
Rev:	03

Slot:	00:1d.2
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #3 [2936]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f0]
Rev:	03

Slot:	00:1d.7
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB2 EHCI Controller #1 [293a]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f1]
Rev:	03
ProgIf:	20

Slot:	00:1e.0
Class:	PCI bridge [0604]
Vendor:	Intel Corporation [8086]
Device:	82801 Mobile PCI Bridge [2448]
Rev:	93
ProgIf:	01

Slot:	00:1f.0
Class:	ISA bridge [0601]
Vendor:	Intel Corporation [8086]
Device:	ICH9M LPC Interface Controller [2919]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f6]
Rev:	03

Slot:	00:1f.2
Class:	SATA controller [0106]
Vendor:	Intel Corporation [8086]
Device:	82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode] [2929]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f8]
Rev:	03
ProgIf:	01

Slot:	00:1f.3
Class:	SMBus [0c05]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) SMBus Controller [2930]
SVendor:	Lenovo [17aa]
SDevice:	Device [20f9]
Rev:	03

Slot:	03:00.0
Class:	Network controller [0280]
Vendor:	Intel Corporation [8086]
Device:	PRO/Wireless 5100 AGN [Shiloh] Network Connection [4237]
SVendor:	Intel Corporation [8086]
SDevice:	WiFi Link 5100 AGN [1211]
PhySlot:	1