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Somehow Wi-Fi stopped connecting on my phone. It is not a hardware issue, as it does work when I perform a reset.

What files do I need to delete to get Wi-Fi back working? I don’t want to reset my phone.

If relevant, model is Sony Arc S, using CM9.

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It shows „avoided low quality connection” or something like that. –  kinokijuf Aug 31 '12 at 8:05
    
I guess it said avoided poor Internet connection, right? –  Izzy Apr 27 at 11:15
    
@Izzy translation differences. –  kinokijuf Apr 27 at 12:48
    
Especially if your system language isn't set to English, yes :) But my link still points to the same issue you're having I think? –  Izzy Apr 27 at 12:56

2 Answers 2

up vote 6 down vote accepted

I removed /data/etc/wifi, /data/misc/dhcp and /data/misc/wifi and it worked.

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For readers: I rejected an edit suggested by a new user for this post who had this to say: "Don't do this. You will simply lose the wi-fi connection function altogether after reboot. This procedure will ruin your wi-fi connection for good and force you to hard reset your phone. Pure sabotage.". // I found it worthy to be mentioned so I posted a comment on the user's behalf. –  Firelord Jul 18 at 14:27

This has happened to me on several occasions, mostly when backing up/restoring Wifi settings using an app such as TitaniumBackup. You have a few options:

  • If your wifi turns on but won't connect, go into the wifi settings and remove the problematic network as well as any other unused networks:
    https://support.google.com/android-one/answer/2819519Remove a Wi-Fi network
  • The wifi network settings are kept in a text file (/data/misc/wifi/wpa_supplicant.conf), which can become corrupted. I've been able to fix problems by manually editing the file:
    1. Turn off wifi (if you leave it on, the corrupted wifi settings may get rewritten)
    2. Back up /data/misc/wifi/wpa_supplicant.conf
    3. Remount /system partition as read-write
    4. Edit /data/misc/wifi/wpa_supplicant.conf and remove any problematic networks
    5. Reboot
  • If you don't care about losing all of your saved networks, you can start with a clean configuration:

    1. Turn off wifi
    2. Back up /data/misc/wifi
    3. Remount /system partition as read-write
    4. Remove /data/misc/wifi
    5. Reboot

    The folder should be recreated on reboot with default settings, then you'll need to set your networks up again from scratch.

  • Another possible option: FXR WiFi fix and rescue. I have absolutely no idea what it does, but my best guess is it attempts to repair the wpa_supplicant.conf file.

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