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T420 Wifi upgrade with AC 7260

T400/410/420 and T500/510/520 series specific matters only
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gpe
Posts: 2
Joined: Fri Apr 19, 2019 4:34 pm
Location: Paris, France

T420 Wifi upgrade with AC 7260

#1 Post by gpe » Fri Apr 19, 2019 4:53 pm

Hi,

I've a T420 (model 4180AT9). Originally it has a wifi card N 6205 and a bluetooth card (under the keyboard if I well understood). With the N 6205 I able to see 2,4 and 5 GHz network. As my router support wifi AC I bought an Intel AC 7260HMW card. I replaced the BIOS by a mod BIOS without whitelist.
I putted a tape on pin 51 allowing the bluetooth to work. So at this point the wifi and the bluetooth are well detected with linux or windows 10.
My problem is with the 5 GHz wifi which is not working. I see only the 2.4 GHz network.
I tried to play with lot of parameters but without any success.
Is anyone already encountered this kind of problem?

gpe
Posts: 2
Joined: Fri Apr 19, 2019 4:34 pm
Location: Paris, France

Re: T420 Wifi upgrade with AC 7260

#2 Post by gpe » Wed May 01, 2019 7:53 am

Finally I returned the board to Amazon and I bought another one from Ebay. The new one works fine (just need to put a tape on pin 51 to enable the BT).
So I guess that the first board was a N version and not an AC even if it was branded as AC ...

w0qj
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Posts: 1018
Joined: Fri Jun 11, 2004 9:53 pm
Location: Hong Kong

Re: T420 Wifi upgrade with AC 7260

#3 Post by w0qj » Thu May 02, 2019 12:49 am

Bonjour!

Happy to hear that your AC7260 WiFi upgrade had worked out for you!
Daily Driver: X1 Extreme 1st Gen (X1E1): i7 | 16GB | 1TB | IPS
Current Thinkpads: X1E1 | X1C4 | X1C3 | X250 | X230 | T410
Retired Thinkpads: T42 | 560 (circa 1996)
~~IBM Thinkpad era computer bag !

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