X220 doesn't recognize Wifi-card

Hi everybody, I ran into some issues with my X220 some weeks back and have been trying to fix them to no avail. As far as I can remember I took some time a few weeks back to install the 1.40 firmware-update and also updated the battery-firmware in the same routine. I'm not sure If it was immediately afterwards (since I'm using a dock with LAN), but the wifi-card (Intel 6205) wasn't recognized by the OS anymore. No entry in the device manager! Here's what I've seen/tried so far:1) What I was firstly able ot see was that the device would sometimes show up after returning from sleep when not in the dock.2) Since I have an Ericson WWAN-card i switched mPCIe places. WWAN-card works in both slots. No recognition of the Wifi-card in both. >> So it doesn't seem to be related to mPCIe or the board.3) My guess was a faulty card, so I tried a newly-bought Intel 7260 Wifi-card in the slot.3.1) The Wifi-card must have been recognized by the BIOS, since the whitelist-fault was presented and I had to remove it to even be able to boot again.3.2) As the warranty wasn't my concern anymore anyways I flashed a whitelist-disabled version of the 1.40 firmware. As promised, I was able to boot with the 7260 card.3.3) Yet still, the card is not presented in the device manager.4) Since my Windows 7-installation had quite some time on its shoulders I reckoned that maybe another OS would be able to properly recognize the card. I just freshly installed Windows 10 and again - nothing is able to bring back the Wifi-card.5) I used a linux live distribution to check whether that one recognizes any of the the cards. It also wasn't able to see any of the two. Does anyone have any experience with this kind of issue? With best regards and a hopeful thanks in advance, Christian

Update:
I used a debian live installation running from a pendrive to look for detected hardware. No wifi was found - again for both cards.
I'm really lost for ideas at this point. What really irritates me is that the BIOS/UEFI recognizes the 7260 card with correct VID and PID. Yet still the cards are somehow (I guess) not made available to the operating system.
On another note: I've just noticed that I posted in the wrong forum section. It's about an X220, so the "ThinkPad X Series Laptops" forum would be the correct one. Could a moderator maybe move this topic?

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A week or so ago I ran Lenovo System Update, which prompted me to update the drivers for my WiFi card (Intel 6200-AGN). After the update Access Connections can no longer recognize the card. Windows still connects automatically to wireless networks through the built-in software, but Access Connections not working is really bothering me.
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Solved!
Go to Solution.

It's a new version AC related issue. Uninstall it and install previous version 5.93, manually.
x220 | i5-2520m | Intel ssd 320 series | Gobi 2000 3G GPS | WiFi
x220 | i5-2520m | hdd 320 | Intel msata ssd 310 series | 3G GPS | WiFi
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X220 doesn't recognize Wifi-card

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