Wifi shows error on Huawei U8500

Question

I can not turn on my android device Wifi. It shows error. My device is Huawei U8500. I am using CyanogenMod 7.2.0 Update-6. Please help with this?

Answer 1

You phone, Huawei U8500 may have the boot kernel and the system modules with different versions.

Since you aren't providing the error message contents, I'll assume that you're just getting a plain wifi error notice instead of the usual wifi connecting to...

Generally speaking,

The kernel (which is on boot.img) must match the WiFi modules version (which is on system) if not, WiFi cant be loaded.

What you need to do is:

Install 7.2 and flash the boot separately, so the boot kernel and the system modules can obtain the same version.

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A similar case:

You can read about a similar case in detail at:

• cyanogenmod - Issue 5435: Wifi error after 7.2 install on Incredible S

To summarize it:

A user performed an update to the system version 7.2, but didn't flash the boot to the same version.

Every time the user tried to use WiFi, the message wifi error was presented.

If he rolled-back to the previous version, the WiFi worked just fine.

After some discussion and exchanging of ideas, he came up with a solution:

Resolved. Here is the clear solution (not completely clear earlier).

1. Install CM 7.2 OTA when prompted
2. DO not roll back to 7.1
3. THEN extract boot.img from the cm 7.2 zip, reboot the phone to bootloader, fastboot flash boot boot.img using PC

So what was happening to this case:

When the user had 7.1 installed and the phone had:

• boot - 7.1 kernel
• system - 7.1 modules

After the installation of 7.2, the phone had:

• boot - 7.1 kernel
• system - 7.2 modules

When re-installed 7.1, the phone had:

• boot - 7.1 kernel
• system - 7.1 modules

so everything worked

When the user installed 7.2 and flashed the boot separately the phone had:

• boot - 7.2 kernel
• system - 7.2 modules

and everything worked

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Related reading:

• cyanogenmod - Fastboot