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I have a Huawei E3131 3G modem and it doesn't work on latest 2012 MacBook Air. It works with older versions of OS X with USB 2.0 so it looks like the only problem is USB 3.0.

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Are you sure the problem is USB3? I suspect the issue might be 32-bit vs 64-bit kernel drivers. Can you share the output of the uname -a terminal command on a system where it works and on a system where it doesn't? The output of the kextstat command on each would also be useful. – pmdj Aug 11 '12 at 10:03

My personal experience with Huawei is that their installation app doesn't even run on a recent Mac for some reason. When I used it, I used to look into the package content to find another installation app that would actually start. If that is not the problem, please put more details.

pmjordan might be right as well as far as 32/64 bit-ness of their installation app. USB2/3 should be backward/forward compatible as per their specs as far as I know.

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I solved my problem! I had the same problems with my mid-2012 MacBook Air and a Huawei 122 stick. Changed the stick to a Huawei 1221 first, then did some software upgrades, which nevertheless was helpless. Yesterday, I bought a USB 2.0 Hub (from Belkin) and everything's fine!

The guys from an Apple shop in Vienna told me that the MacBook Air starting from mid 2012 now has an unusual USB 3.0. (I can't explain in detail.)

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It does seems like a problem with USB3 but to isolate it try two things: 1. Connect it to 2012 Air through USB hub 2. Connect it to a mac w/o USB3 but with OS X 10.8 onboard

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It's a firmware issue. It will only connect via an USB 2.0 HUB.

Huawei has a firmware update for the modem but you won't find it anywhere. It's being distributed only via the carriers. The MobilePartner application update will not help.

There is hope.

You need "E3131Update_21." and "Universal MasterCode.exe". You can search for them on Google. Or you can get them here.

The Mastercode application is required for the firmware update code. Launch it and select general huawei dongle (or don't select anything) and input your dongle IMEI. Use the software update key not the unlock key.

I got it working for my MacBook Air 2013 and MacBook Pro 2012, with 10.8 and 10.9 (Developer Preview) with this firmware update.

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Can you please add direct links to the downloads instead of sending everybody to Google? – patrix Aug 9 '13 at 12:07
I cannot. Posting links to it is not allowed, they are infringing. But the first 2-3 links have the file that you need. What I can confirm is that I have successfully upgraded 2 USB sticks. EDIT: I have found a way. – Zeno Popovici Sep 26 '13 at 20:50
Linking is not infringing usually, and it increases the chance that people will download the right file. – patrix Sep 26 '13 at 21:00
I've linked the file. – Zeno Popovici Sep 26 '13 at 21:01

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