Trouble setting up Huawei E3531s-2 with "SMS notifications via GSM-modem" Integration

Hardware
9

So. After two hours of fiddeling, I finally got it to work by downgrading to a 21.XX Firmware.
Here’s a short writeup of what I’ve donw, maybe it’s helpful to somebody else in the future.
Everything was tested with a Huawei E3531s-2 GSM Stick with Firmware 22.318.27.00.00, other sticks might behave similar.

  1. Open Huawei Unlockcode Generator, enter the IMEI of your stick and press the button below. Then, write down the generated codes. (in some cases, you’ll need the flashcode to update the stick)

  2. Open this website and download the given .zip file. (if, like in my case, the download doesn’t work, you may download the .zip file from here, this download is also linked to in the comments ot the website.

  3. download a Ver. 21.XX firmware package for your stick, a package for the E3531 may be found here.

  4. extract both downloaded files.

  5. Open the [1] Mobile Broadband HL Service folder inside the Huawei_3372h-153_hiLink-to-Stick folder and execute the given mbbServiceSetup.exe.

  6. Open the [2] DataCard driver and execute the DriverSetup.exe.

  7. plug the gsm stick into the computer and wait until it has booted up successfully (this should be indicated by a browser window opening with the stick’s webui). Then, open the [3] Switchmode E3372h folder and execute the given sw_project_mode.cmd. The browser window should become unresponsible and in Devicemanager, a COM Port, named PC UI (or similar) should appear.

  8. Open the downloaded firmware package end execute the given firm update. If you get a ERROR 10: PORT not found, that means the stick hasn’t exposed a PC UI interface.
    If everything went well, the Stick should expose a network adapter called HUAWEI Mobile Connect - Network Card

  9. Congratulations, now your stick should have a firmware Version 21.XX and you may use with the sms integration. (Note: As I’ve read, on some firmware versions, further actions might be required. if so, continue from step 12 on this page. These steps require you to connect to the stick using a serial terminal. These Settings worked for me:

Baudrate: 75600
Data bits: 8
Stop bits: 1
Parity: None
Flow controll: none/off
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