09-21-2018 01:28 AM
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  1. MisterXtm's Avatar
    1. Root your phone
    2. Download Root Explorer.apk, put it on your phone via USB, install it
    3. navigate to either /data/misc/wifi or /system/etc/wifi
    4. rename or delete wpa_supplicant.conf
    4.5. reboot
    5. ???
    6. PROFIT!
    Hi! I've tried all this, renamed the file both in system and in data and it doesn't recreate them on reboot. Any idea why it doesn't or some other workaround to fix the wifi issue?

    Thanks!

    EDIT: I did some research on this, but it didn't help me any further. Maybe somebody here can:

    CatLog shows following errors:
    WifiHW: return of insmod : ret = -1, No such device
    WifiStateMachine: Failed to load driver
    WifiStateMachine: sendErrorBroadcast code:10

    For me it seems the issue already starts before loading the .conf-file, which actually seems to be fine. wlan0 is missing though. In my oppinion this is causing all the other problems. Maybe a boot log could help. I couldn't find a way to look at or save it though..

    I'm using the following stock firmware at the moment: I9505XXUFNB8_I9505OXAFNB8_I9505XXUFNB8_HOME.tar.md5
    Until today the phone wasn't rooted and the problems didn't start with an update, if I can recall corectly. I waited on the new OTA update (4.4.2), hoping it would solve the wi-fi issue, but it didn't. Only then I started rooting and digging..

    Thanks again!
    03-05-2014 01:13 PM
  2. Spacemanben's Avatar
    Mine made a new supplicant and I compared the two. Change the line "ctrl_interface=wlan0" to "ctrl_interface=/data/misc/wifi/sockets"
    That seems to be the error within the supplicant file itself.

    The wlan0 reference is a bug as far as I can tell.
    03-10-2014 05:32 AM
  3. MisterXtm's Avatar
    Mine made a new supplicant and I compared the two. Change the line "ctrl_interface=wlan0" to "ctrl_interface=/data/misc/wifi/sockets"
    That seems to be the error within the supplicant file itself.

    The wlan0 reference is a bug as far as I can tell.
    Thanks for your answer. Can you tell me what else you have in your .conf-file? I tried changing it, but after a restart the wlan0 is there again. Also: what file did you change? The /data/misc/wifi or /settings/etc/wifi one?

    I described my issue in detail over here: [Q] Samsung Galaxy S4 LTE (I9505) - Update to 4.4.2, wifi problems remaining - xda-developers. As you can see, I would be also interested in the contents of /data/.cid.info.

    Thanks again!
    03-10-2014 09:22 AM
  4. Spacemanben's Avatar
    I changed the \misc\wifi one. Further reading and experimenting makes me believe this is an issue we will need to wait for Samsung to fix.

    Alternatively you could flash a custom rom onto your advice, tho I take no responsibility for any problems you have if you do that. ( Insert standard disclaimer here)

    Ill look at my phone and try and put up the contents of those two files, but i flashed the ROM, so no guarantees its the same.
    03-10-2014 06:04 PM
  5. Spacemanben's Avatar
    The files are as follows...

    data\misc\wifi\wpa_supplicant.conf

    ctrl_interface=/data/misc/wifi/sockets
    disable_scan_offload=1
    update_config=1
    device_name=liquid_jflte
    manufacturer=samsung
    model_name=GT-I9505
    model_number=GT-I9505
    serial_number=2405af88
    device_type=10-0050F204-5
    config_methods=physical_display virtual_push_button
    p2p_disabled=1

    (Previously saved access point details are here in the file. Not sharing those. Sorry.)

    . Cid.Info

    semcosh

    Let me know if you need anything else...

    On a side note I moved to a custom ROM and my wifi is fine now. Definately a software issue. A custom ROM may be a good answer, if you wanna go down that path.
    Again, standard disclaimers apply. I'm not responsible, etc....
    03-11-2014 02:21 AM
  6. MisterXtm's Avatar
    Thank you very much for these infos! I've tried them, but didn't have any luck for now.

    Can you please tell me if you have anything in your /data/misc/wifi/sockets folder? Mine is empty..

    I also don't know what type of wifi/bluetooth-chip I have. I suppose it should be a "murata fem1", not a "semcosh", but I have no idea how to check it.
    03-13-2014 04:32 AM
  7. Kyle Richards1's Avatar
    All you have to do is reboot your phone. When turning it on hold the volume up button while holding power button. Once it starts to turn on it will say something like rebooting in small blue at top left. Then let go of buttons and it will start as normal. This has worked for me.
    03-13-2014 07:09 AM
  8. Kory Nightflamez Foster's Avatar
    could you more clearer? im having an issue with my wifi
    03-17-2014 02:07 AM
  9. linkin pork's Avatar
    Try this : pull out your battery and put it back after half hour, your wifi will come back again, i tried twice, it works for my s4.
    03-17-2014 02:08 AM
  10. Melanie Stamper's Avatar
    So, my s4 says that i am connected to wifi, like my home wifi and such, but whenever i try to refresh or reload an app such as facebook or twiiter, it says i am not connected to the internet. Please help!!
    03-22-2014 11:19 PM
  11. russjohnson's Avatar
    With the phone on, pull the battery out and put back in.

    Posted via Android Central App
    03-23-2014 11:04 AM
  12. nedbeau's Avatar
    Kevin Spring 1 - it might work for some but not all SG4's
    03-24-2014 03:09 PM
  13. erasable's Avatar
    this happened to my wife's s4 today out of nowhere. to fix it i rebooted into recovery and formatted the cache.
    03-24-2014 03:58 PM
  14. Andrew Reynolds's Avatar
    I had the same issue. I pulled out the battery and put it back in. Then restrated the phone and it was back to working.
    pipo3k and graysteg like this.
    03-26-2014 10:38 AM
  15. pipo3k's Avatar
    Android 4.3: Removing the battery for a couple of minutes fixes the problem. (WiFi passwords gone thought, so it looks like android detected that something was wrong and replaced the file ?!)
    03-26-2014 06:28 PM
  16. tuk3r's Avatar
    ok, i had to sign up just to post this in the hope it helps others.

    my problem was the wifi button wouldnt turn on no matter what i did, i switched it on and it would switch off. anyhow...people suggested to root the phone then rename a wifi file and it will fix the problem. again this didnt work, i didnt have a clue on how to root, but after 5 hours i feel like an expert hehe. i managed to unroot the phone back to stock.

    i got speaking with a fella from another forum, he suggested dialing *#0011# and enter the service menu, from there hit the menu button and choose wifi, then turn off WiFi Power Saver Mode. i did this and exited. i then tried the wifi, it never worked but i then re dialed *#0011# and entered the service menu once more, hit the menu button and choose wifi, then turned on WiFi Power Saver Mode. after doing this it has worked flawlessly ever since. doing this resets the wifi cache. so in short disable WiFi Power Saver Mode then exit, then enable WiFi Power Saver Mode again.

    i thought i would post a solution that worked first time for me, like i say i tried rooting and unrooting but nothing worked. i only hope this will work for you.

    please reply if this helps you in anyway so others can benefit.

    thanks.
    03-26-2014 06:38 PM
  17. mujtaba nara's Avatar
    I have the same problem .. Please help
    04-10-2014 12:04 PM
  18. metle_geek's Avatar
    ok, i had to sign up just to post this in the hope it helps others.

    my problem was the wifi button wouldnt turn on no matter what i did, i switched it on and it would switch off. anyhow...people suggested to root the phone then rename a wifi file and it will fix the problem. again this didnt work, i didnt have a clue on how to root, but after 5 hours i feel like an expert hehe. i managed to unroot the phone back to stock.

    i got speaking with a fella from another forum, he suggested dialing *#0011# and enter the service menu, from there hit the menu button and choose wifi, then turn off WiFi Power Saver Mode. i did this and exited. i then tried the wifi, it never worked but i then re dialed *#0011# and entered the service menu once more, hit the menu button and choose wifi, then turned on WiFi Power Saver Mode. after doing this it has worked flawlessly ever since. doing this resets the wifi cache. so in short disable WiFi Power Saver Mode then exit, then enable WiFi Power Saver Mode again.

    i thought i would post a solution that worked first time for me, like i say i tried rooting and unrooting but nothing worked. i only hope this will work for you.

    please reply if this helps you in anyway so others can benefit.

    thanks.
    No when you rooted it you should of went got the odin .tar files and re flashed your modem it would of put a clean flash as it would rewrite the modem files after ota updates sometimes it doesn't re rite it like it should and this causes your wifi cell data and GPS to crash but with clean flashes it cleans it up but I'm glad to see someone found an alternative way as most people faint and ring the hepatic bell when you mention rooting

    Sent from my SAMSUNG-SGH-I337 using AC Forums mobile app
    04-12-2014 04:20 PM
  19. Bradley Lewis's Avatar
    Strangest fault, can't enable Wi-Fi, Wi-Fi Hotspot or Bluetooth... When I pull down the screen from the top to bring up the quick select enable menu Wi-Fi will not turn on, it is preselected and a very light green colour instead of a grey for disabled or bright green when it is enabled... Holding the Wi-Fi button down and entering the option doesn't help either as it says "turning on" but does nothing... the toggle switch to turn Wi-Fi on also does nothing.
    I have reset the device several times and have also now tried a factory reset... which I really didn't want to do and it still hasn't helped. I have searched forums and google for any sign of this same fault and found nothing. I also can't enable portable Wi-Fi hotspot or Bluetooth... Can someone please advise?
    Took the battery out while the phone was still on and that did the trick

    Took the advice on here about the wifi button not sliding my galaxy s4 and thanks it's now working again
    04-12-2014 09:06 PM
  20. spwong's Avatar
    Hi, I am unable to replaced wlan0 to your suggestion but unable to save changes..why? can u pls help..tq

    Change ctrl_interface=wlan0 to ctrl_interface=/data/misc/wifi/sockets

    The reference to wlan0 is a bug, far as I can tell.
    04-20-2014 04:20 PM
  21. Tiffany Anderson3's Avatar
    Same thing with my galaxy s4 I haven't been able to use my wifi for weeks now, I took the battery out of the phone for a total of 10 minutes and restarted and.... wallah my wifi is on and working, Hallelujah!!!
    Anyone else having the same issue do yourself a favor and try this first, rather than technical mumbo jumbo
    04-20-2014 10:33 PM
  22. MAESADA's Avatar
    Way to solve the problem of Wi-Fi in the immediate
    Wi-Fi Tethering → ON → OFF



    It is a language of Japanese, but I wonder if you can see the sign?
    04-27-2014 10:46 PM
  23. 1caiser's Avatar
    All of you and your technical stories were fun to follow, only that when I tried, it all ended in failure.

    Battery popping, factory reset, blowdryer to the motherboard, upgrading to Kit-Kat, rooting and trying to install a mod (Cyanogen in my case), and finally sending into Samsung to get it back on [Beyond Economic Repair].

    Follow these steps ONLY AS LAST RESORT. 'CUZ THAT'S WHAT I DID.

    THE ONLY WAY I GOT MY PHONE TO COME BACK:

    1. Get Samsung Kies.
    2. Get Odin and a .tar file for your Galaxy (Probably from StockRoms.net or some similar mirror. The download file should be about 1.6 GB [forum calls this "Gingerbread", I meant "Gigabytes").
    3. Put Galaxy into downloading mode.
    4. Start Odin and plug in your Galaxy to the computer.
    5. Select PDA and put in the .tar file.
    6. Hit [Start] on Odin.
    7. When phone has a blue bar, unplug the Galaxy. This will put it in emergency mode, where it has a corrupted iOS or something (I'm not a technical genius).
    8. Go to Samsung Kies and go to [Tools] > [Firmware Upgrade and Initialisation].
    9. Type in the Model Code. You can find this on your phone, behind the battery (you shouldn't have plugged in the phone yet).
    10. Type in the Serial Number (on the tag, it's labeled "S/N").
    11. Proceed with firmware upgrade (press OK). Proceed with data wipe (Press OK).
    12. Let the download go through. Chill, go get something to drink, etc.
    13. Now with your Galaxy, pop in the battery and put it in Download mode. You shouldn't see Emergency mode anymore (at least that's what happened to me, Emergency just disappeared).
    14. Let the downloading go through. Should take a while, so chill some more.
    15. When the phone is done updating, it should be in setup mode from the last Kies firmware upgrade. Proceed with phone setup and enjoy fixed Wi-fi.


    The plug-pull was an accidental discovery.

    -Kai
    04-29-2014 02:39 AM
  24. curious09's Avatar
    hi I was wondering if you've found a solution for your issue?? I know this post is very old, but I am just now having this problem and i'm looking for a fix asap.
    04-29-2014 06:03 PM
  25. Yau007's Avatar
    Same to me. My S4 just got repaired with a dead charging port (not included in warranty as they claimed). I got my phone back yesterday but found the WiFi switch cannot be enabled. I have tried all the methods as mentioned from page 1 of this thread, none of them works. I am considering to return it back to Samsung CSC. Any other hints before I do that as it was bought o/s while Australia Samsung does not provide worldwide warranty.
    04-29-2014 07:23 PM
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