Develop Bugs

Help-Wifi not working."unable to scan networks"

Hey guys im stuck with some dead wifi, i try and connect through settings after a fresh restart and when scanning i get a popup saying "unable to scan networks. Ive been using different roms since original stock 2.1 and ive never had this specific issue. Does anyone know if there is a way to fix this without having to reload my nandroid backup? Or at worst odin. Which i dont mind doing because i have backups, its just a pain in my arse.
Also i think this started happening after i ran wifi tether the other night for like an hour. My phone reboot a few times because wifi tether adhoc is so bugged but yea, maybe that crashed something. I dunno.... any help is greatly. Appreciated.
Sent from my SPH-D700 using XDA Premium App

Maybe you have a hardware problem/failure.

You can try clearing data cache and Dalvik cache in Clockwork.

Unfortunately clearing dalv and data put me in an odd boot loop. I just did a nandroid backup and that fixed me right now. Not sure what killed my wifi.

juanaraya92679 said:
Unfortunately clearing dalv and data put me in an odd boot loop. I just did a nandroid backup and that fixed me right now. Not sure what killed my wifi.
Click to expand...
Click to collapse
So your wifi is fixed too?
Do you BONSAI?

kennyglass123 said:
So your wifi is fixed too?
Do you BONSAI?
Click to expand...
Click to collapse
Wifi is fixed now but the suggestion of clearing data and dalvik put me in a boot loop.
All is well now. going to just leave everything how it is until Gingerbread

juanaraya92679 said:
Wifi is fixed now but the suggestion of clearing data and dalvik put me in a boot loop.
All is well now. going to just leave everything how it is until Gingerbread
Click to expand...
Click to collapse
Sounds like there was more data corrupted somewhere and restoring the nandroid brought you back to before that happened.

[Q] TMO SGH-T989 wifi not working. is this h/w issue?

I bought this phone used from eBay and it worked fine for about a month.
Then the Wi-Fi stopped working. as you can see in the pictures, the wifi button (slider) is disabled/grayed out and if you go into the menu, it is stuck on "Turning wi-fi on".
I've tried everything from downgrading to 2.3.6 GB (currently on official ICS 4.0.4 through Kies) to installing Cyanogen mod ROM but it wont work. rooted then unrooted. everything else works great.
Any help would be appreciated.
I've attached screen shots to this post.
Thanks.

Did you powercycle modem and then router?
Sent from my SAMSUNG-SGH-T989 using xda premium

Spastic909 said:
Did you powercycle modem and then router?
Sent from my SAMSUNG-SGH-T989 using xda premium
Click to expand...
Click to collapse
Yup. I did. I have other devices on home wifi that have no problems connecting. In addition i have tried at starbucks and work wifi. Still no go.
The WiFi on the Galaxy S2 wont even turn on to recognize/select networks (SSIDs) to connect to. As you can see in the pics, the Wifi ON/OFF button is grayed out/disabled.

Did you try flashing a different radio since the issue started? If not I would try it, maybe downgrade the radio to UVLI1 or even try re-flashing the same radio. I know I had this issue once before but fixed it somehow, I think it was just a reboot for me but if you tried all of what you said in the OP you would have rebooted a few times.

Did you use Odin to flash back to stock? If not, give it a try with a full wipe.

Although i have not tried to mess with Radio (noob here, not sure i wont mess that up), I did Odin the phone back to stock ROM with no luck.

TheVJ said:
Although i have not tried to mess with Radio (noob here, not sure i wont mess that up), I did Odin the phone back to stock ROM with no luck.
Click to expand...
Click to collapse
When you flash a stock rom in Odin, it also flashes the radio.

Towle said:
When you flash a stock rom in Odin, it also flashes the radio.
Click to expand...
Click to collapse
Ah Ok. There you go then. and i tried with a couple of TMO stock ROMS (starting with GB 2.3.6). so obviously that hasnt worked. Thanks.

i found a possible fix, that worked for me. Go into your recovery, i did it with TWRP (latest one) and advanced and fix permissions, than i rebooted and worked! Give it a try.

gulbir101 said:
i found a possible fix, that worked for me. Go into your recovery, i did it with TWRP (latest one) and advanced and fix permissions, than i rebooted and worked! Give it a try.
Click to expand...
Click to collapse
To avoid any future hassles I contacted the seller and he agreed to take it back for a full refund, so i guess i'll never know what happened. Thanks for your help everyone.

I know this thread is nearly a year old, but I had this problem and figured out a fix that worked for me so I know its still relevant.
My fix was:
- reboot into latest cwm recovery (v6.0.4.3 touch for me)
- click "mounts and storage"
-click "unmount /cache"
-reboot
So far it has worked every time and wifi screw ups have happened rarely ever since. Hope this late post helps at least one person who was as frustrated as me!

Klenon said:
I know this thread is nearly a year old, but I had this problem and figured out a fix that worked for me so I know its still relevant.
My fix was:
- reboot into latest cwm recovery (v6.0.4.3 touch for me)
- click "mounts and storage"
-click "unmount /cache"
-reboot
So far it has worked every time and wifi screw ups have happened rarely ever since. Hope this late post helps at least one person who was as frustrated as me!
Click to expand...
Click to collapse
your wifi also stuck in turning on? i want to try this but i just want to make sure what state ur wifi is in.. because my wifi is stuck on "turning on" only.. im on stock 4.1.2 can you please post more details if you dont mind thanks!

mike1824 said:
your wifi also stuck in turning on? i want to try this but i just want to make sure what state ur wifi is in.. because my wifi is stuck on "turning on" only.. im on stock 4.1.2 can you please post more details if you dont mind thanks!
Click to expand...
Click to collapse
My WIFI is off, and if I hit turn on, it got stuck on turn on. But if I were to back out and go back in, it would be on off again.
I'm using Kitkat
After awhile all i had to do to fix it was turn airplane mode on and off. But just the other day, I was flying so had my phone in airplane mode and now that won't fix it and neither will my original fix :crying:

I have the same problem
It was working fine stopped and did everything and still not working,

WiFi not turning on?

Ok so a couple of days ago I installed a 4.0 ready radio on my galaxy s2 and then went on to install Jedi Knight 6 ROM (4.0.4 and radio is UVMC6) and after installation everything was working fine.. I was messing around for a while.. it worked today, I shut my phone off to charge it up real quick, and when I turned it back on my WiFi would not connect. Well not necessarly connect.. it just wont even turn on. When I go into settings and click WiFi, it just sits there saying, Turning WiFi on, and never changes.. I can't seem to imagine what could have happened to it, and I really dont wanna have to reinstall the ROM again because i just spent hours getting this one all set up to my liking...
Anyone got any ideas?
EDIT: BTW, I have tried many things.. Tried airplane mode to disable everything then turn it back on, obviously tried rebooting the phone, i have tried wiping cache in CWM recovery and also tried fix permissions in recovery (another topic said to try those..)
Nothing has worked so far, i'm about to try reflashing my radio, see if that works.. but I really really dont want to have to reflash my whole ROM.. So if anyone has any other ideas please help, i'll edit if the radio works..
EDIT 2: Reflashing the radio did nothing.. it's really wierd, the data, bt, gps.. all of it works fine, it's just the WiFi that's frozen turning on... cant get it to stop turning on and can't get it to actually turn on..
EDIT Final: Ok well, i guess nobody knows what might have been going on.. so I just wound up reflashing my ROM, which obviously fixed it.. i just had to lose all that time spent setting everything up... But oh well.. Kinda sucks nobody even tried to help..

Gopher love said:
Ok so a couple of days ago I installed a 4.0 ready radio on my galaxy s2 and then went on to install Jedi Knight 6 ROM (4.0.4 and radio is UVMC6) and after installation everything was working fine.. I was messing around for a while.. it worked today, I shut my phone off to charge it up real quick, and when I turned it back on my WiFi would not connect. Well not necessarly connect.. it just wont even turn on. When I go into settings and click WiFi, it just sits there saying, Turning WiFi on, and never changes.. I can't seem to imagine what could have happened to it, and I really dont wanna have to reinstall the ROM again because i just spent hours getting this one all set up to my liking...
Anyone got any ideas?
EDIT: BTW, I have tried many things.. Tried airplane mode to disable everything then turn it back on, obviously tried rebooting the phone, i have tried wiping cache in CWM recovery and also tried fix permissions in recovery (another topic said to try those..)
Nothing has worked so far, i'm about to try reflashing my radio, see if that works.. but I really really dont want to have to reflash my whole ROM.. So if anyone has any other ideas please help, i'll edit if the radio works..
EDIT 2: Reflashing the radio did nothing.. it's really wierd, the data, bt, gps.. all of it works fine, it's just the WiFi that's frozen turning on... cant get it to stop turning on and can't get it to actually turn on..
EDIT Final: Ok well, i guess nobody knows what might have been going on.. so I just wound up reflashing my ROM, which obviously fixed it.. i just had to lose all that time spent setting everything up... But oh well.. Kinda sucks nobody even tried to help..
Click to expand...
Click to collapse
+1 I'm going through the same thing now

I have been having this same issue as well. It started out as stock happening sporadically. One thread suggested rooting and removing my account. Problem still occurring. Tried flashing multiple ROMs and now WiFi hasn't connected at all always stuck at turning on. I have tried clear cache, fix permissions, as well as reinstalling ROM dirty and with factory reset. I'm hoping this isn't hardware failure because I just bought this phone used but it seems to be a reoccurring problem with others as well. Any NEW suggestions not given from quick Google/xda search?

stoneduser8907 said:
I have been having this same issue as well. It started out as stock happening sporadically. One thread suggested rooting and removing my account. Problem still occurring. Tried flashing multiple ROMs and now WiFi hasn't connected at all always stuck at turning on. I have tried clear cache, fix permissions, as well as reinstalling ROM dirty and with factory reset. I'm hoping this isn't hardware failure because I just bought this phone used but it seems to be a reoccurring problem with others as well. Any NEW suggestions not given from quick Google/xda search?
Click to expand...
Click to collapse
I'd suggest to check your Wireless Access Point (modem or router) wireless settings for security, check and see if it's set to use WPA/WPA2, which is common on some modems/routers, change it to either WPA or WPA2 (preferred) not both, it's a known issue with WiFi networks and having it set to using both, I had the same problem before with my phone connecting to my WiFi.
Also if you use MAC Address Filtering on the modem/router, you should disable/clear that and let phone re-connect before enabling mac filtering again.

Almite said:
I'd suggest to check your Wireless Access Point (modem or router) wireless settings for security, check and see if it's set to use WPA/WPA2, which is common on some modems/routers, change it to either WPA or WPA2 (preferred) not both, it's a known issue with WiFi networks and having it set to using both, I had the same problem before with my phone connecting to my WiFi.
Also if you use MAC Address Filtering on the modem/router, you should disable/clear that and let phone re-connect before enabling mac filtering again.
Click to expand...
Click to collapse
The problem I am having is not that it won't connect to a particular network. Wifi will not initialize on the device at all and is stuck in "Turning On..." state. I found more and more posts where people ended up having to send in to Samsung so I spoke with them and even though I purchased the phone used its thankfully still under warranty and they will be replacing it. The did not confirm whether or not it was a true known device issue but were quick to file the exchange for me.

sigh, me too!
Just started having this problem on 4.3.1
great.

In my case, I had to wipe system and data before reinstalling my ROM.
Though the only reason it was happening to me was because Beanstalk 4.4.2 didn't want to get past the splash screen when I tried to install it so I downgraded back to ICS 4.0.4 without wiping. Good luck getting this issue fixed. Also another kernel might fix thingz for you if your current one does not like your device.

I have a similar problem. After a while, WiFi gets disconnected. If I go in settings - wifi, i get the message "unfortunately, settings has stopped" and I can't get WiFi to work again until I reboot the phone. The Wifi works again for a couple of minutes then stops.
I have flashed various different ROM (CM11, PA) but keeps getting the exact same behavior.
I've rebooted in safe mode and I don't get the problem now.

[Q] No Service. Data working but no Call/Text.

Hello!
I have m919 T-Mobile Galaxy s4 but I'm with other carrier (Wind Canada). I rooted the phone about a month ago, I believe, using THIS guide.
I spent yesterday in environment where I didn't had coverage for most of the day, but i haven't gotten it back yet. Sounds really weird as it might be not connected to the fact at all. I have 4G connection active, which means that I have internet, but it keeps 'searching' for service and I can't Call/Text anyone, neither I can receive calls or texts. Instead of the bar at the top showing how good coverage i have it just shows a crossed out circle icon.
I've tried reboots, keeping my phone off for 30mins without battery, taking out sim and putting it back in, changing network modes and resetting APN (all from settings panel).
Have anyone experienced something like that and how do I fix it? It was working perfectly for last couple of months and the phone didn't get any damage yesterday neither.
P.S Did the the regular factory reset (don't know if it affects rooting) but it didn't change anything. =

I have same problem.
Did you solve it? and how?

Haven't solved it, that was the whole point of my post!

kokozaurs said:
Haven't solved it, that was the whole point of my post!
Click to expand...
Click to collapse
Never had this happen to me. Data works off your signal, something is wickedly wrong. I'd flash the modem again if you are on 4.2.2 bootloader (doesn't matter which rom or android version). If that fails, go intonrecovery, wipe cache, wipe dalvik cache, and wipe data. If that fails, backup your data and Odin flash back to 100% stock. If that fails, more than likely your /efs folder was corrupted.
Sent from my SGH-M919 using XDA Premium 4 mobile app

Please don't create multi thread on the same topic

xdapowerapps said:
Never had this happen to me. Data works off your signal, something is wickedly wrong. I'd flash the modem again if you are on 4.2.2 bootloader (doesn't matter which rom or android version). If that fails, go intonrecovery, wipe cache, wipe dalvik cache, and wipe data. If that fails, backup your data and Odin flash back to 100% stock. If that fails, more than likely your /efs folder was corrupted.
Sent from my SGH-M919 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I think I'm gonna flash it back to 100% stock, but the problem is that I'm on mac and I don't know how to flash it back. Is there any guide on how to do it from MAC platform?
Thanks!!

kokozaurs said:
I think I'm gonna flash it back to 100% stock, but the problem is that I'm on mac and I don't know how to flash it back. Is there any guide on how to do it from MAC platform?
Thanks!!
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=755265
http://forums.techdiscussion.in/sho...Heimdall-Terminal-on-Mac-OS-(Odin-Alternative)
Second one will be more helpful. Good luck! :good:

xdapowerapps said:
http://forum.xda-developers.com/showthread.php?t=755265
http://forums.techdiscussion.in/sho...Heimdall-Terminal-on-Mac-OS-(Odin-Alternative)
Second one will be more helpful. Good luck! :good:
Click to expand...
Click to collapse
Ok, so I got heimdall, and got the recovery.img from the other topic. I followed the steps that was provided in the second link, but nothing much changed, it successfully uploaded the recovery.img, then i did recovery boot with power button + home button + volume up, it did some things with a pirate android guy in the back and thats it, booted up. Not sure if I have everything back to stock or not - either way, the issue with the network hasn't been resolved!

kokozaurs said:
Haven't solved it, that was the whole point of my post!
Click to expand...
Click to collapse
Tried this?
go to settings/more networks/Mobile networks/Network operators/Search now......
It might take a minute or two, then show you some networks it finds. Select your provider and it should list some options for you.
need to see Mobile data with a check, Data roaming checked, network mode should be LTE/GSM/WCDMA(auto connect)
If you KNOW what your APN (access Point Name) is you can check if it's correctly there.
It usually is downloaded with the search for network so just try with whatever is ther for now.
Back all the way out, and power off. Take out the battery, wait like 30 seconds, replace the battery and power on again.
See if you get service and can dial out.
Aloha and Good Luck!

bobolinko said:
Tried this?
go to settings/more networks/Mobile networks/Network operators/Search now......
It might take a minute or two, then show you some networks it finds. Select your provider and it should list some options for you.
need to see Mobile data with a check, Data roaming checked, network mode should be LTE/GSM/WCDMA(auto connect)
If you KNOW what your APN (access Point Name) is you can check if it's correctly there.
It usually is downloaded with the search for network so just try with whatever is ther for now.
Back all the way out, and power off. Take out the battery, wait like 30 seconds, replace the battery and power on again.
See if you get service and can dial out.
Aloha and Good Luck!
Click to expand...
Click to collapse
yep, one of first routines i tried. No difference

kokozaurs said:
yep, one of first routines i tried. No difference
Click to expand...
Click to collapse
Ok, now you might want to call your provider and ask them to remove you from their network and reinsert you again. That procedure will often re-enable normal operation of cellular connectivity.
They will ask you to power down and remove your battery for about a minute, then power up again.
Aloha and Good Luck!

Tried it all
Well im in the same boat here.
I checked the IMEI is correct
i did a full stock MK5 install with Odin without sim inserted and with
*#2263# helps it recognizes the network on the search list (WIND)
but it wont connect (failed to connect try again)
sometimes it connects to 4G and i can use the web
but no calls or sms
i noticed i dont have LTE enabled which ill do tomorrow
i even opened my phone to check that no cables came off as it was in service for a broken screen
tried a different sim from koodo wich also acts weird it connects to data but wont make phone calls or sms
the problems began after its been UNLOCKED (sim free)
any suggestions? im willing to try anything
its been in service 4 times and still they cant figure it out...
thanks!

ph3r0c1ty said:
Well im in the same boat here.
I checked the IMEI is correct
i did a full stock MK5 install with Odin without sim inserted and with
*#2263# helps it recognizes the network on the search list (WIND)
but it wont connect (failed to connect try again)
sometimes it connects to 4G and i can use the web
but no calls or sms
i noticed i dont have LTE enabled which ill do tomorrow
i even opened my phone to check that no cables came off as it was in service for a broken screen
tried a different sim from koodo wich also acts weird it connects to data but wont make phone calls or sms
the problems began after its been UNLOCKED (sim free)
any suggestions? im willing to try anything
its been in service 4 times and still they cant figure it out...
thanks!
Click to expand...
Click to collapse
Ok I found the solution. Apparently I have bought a stolen phone. Check the imei if it hasn't been blacklisted!

No WiFi on a refurbished G4, did T-Mobile screw me?

Last week I shattered the screen on my G4 and ordered a replacement through my warranty. I got it today and went to unlock my bootloader immediately, flashed TWRP, and hopped on a custom rom, only to discover that I had no WiFi. Every other device in my house is connected fine so it's not the internet.
From there I figured it must've been a bad flash and used LGUP to flash the 20v kdz (the phone was already on it) so i could start over again with a new radio/modem. I didn't bother setting the phone up again and just rebooted into the bootloader to flash TWRP again, and proceeded to flash AEX again but with f2fs. Again, no WiFi. Thought it must be the rom and clean flashed AICP, no wifi. Clean flashed crDroid, no wifi.
At this point i got desperate and started messing with the wifi settings because a series of reboots could get me WiFi for a few precious seconds, maxing out at about a minute at one point.
Most of the time the WiFi wouldn't turn on at all but a reboot could fix it, but nothing would connect after putting in the password. Trying to manually connect would cause the Wifi to freak out and instantly connect/disconnect or give me a few seconds of wifi before it happened. Only a reboot or airplane mode would "fix" this before I'd have to start the process over again.
I also tried the "Turbo orthodox clean" which only resulted in me not having an internal storage partition and roms not flashing it until i had to kdz.
This happened on all the roms I tried today including an untouched stock after a kdz.
AFAIK I did everything by the book and i cant think of anything i could've done wrong to cause this. Could it be because i didn't boot up into the stock rom the first time i unlocked the bootloader? I did it the rest of the times that i had to kdz.
Wtf can I do at this point? I'm typing this on freshly kdz'd rom with nothing but xda labs installed on top and no settings changed. Could it be a hardware problem? Is it my f*ck up? Should I go through T-Mobile/the insurance again? All i can think to do now is take a full nandroid backup on the old phone and try restoring it on this one in the morning.

Woke up this morning and still had no WiFi, so I carried on with my day as usual. Got home after the gym, took a nap, and woke up to perfectly functioning Wifi
I haven't changed anything at all to fix this, just left the phone alone for ~10 hours. Rebooting didnt break it again either so I'm going to try my luck with crDroid
Sent from my LG-H811 using XDA Labs

Brandon9231 said:
Woke up this morning and still had no WiFi, so I carried on with my day as usual. Got home after the gym, took a nap, and woke up to perfectly functioning Wifi
I haven't changed anything at all to fix this, just left the phone alone for ~10 hours. Rebooting didnt break it again either so I'm going to try my luck with crDroid
Click to expand...
Click to collapse
If it happens again check the MAC address of your phone in WiFi settings. You will get no connection when the MAC is all zeros which can e.g. happen on a bad flash.
.
Sent from my LG-H815 using XDA Labs

steadfasterX said:
If it happens again check the MAC address of your phone in WiFi settings. You will get no connection when the MAC is all zeros which can e.g. happen on a bad flash.
.
Click to expand...
Click to collapse
Thanks, I do have the MAC and WiFi in crdroid but it took a reboot. NEVER MIND. It just went out as I typed that. I'm back to getting it for only a second after turning my WiFi on and off. I cleared my dalvic/cache a minute ago because my SD card showed up as corrupted to fix that, but now I lost the WiFi again. I went about an hour with WiFi but no mods or apps installed and it just went out after flashing magisk + 3 modules and restoring my apps from titanium backup so I'm going to try undoing those one by one to see if that's it
Sent from my LG-H811 using XDA Labs