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  • 1 Post By gidgiddonihah
  1. Thread Author  Thread Author    #1  

    Default Nexus 5: Cell Signal Problem(s) Fix

    This is a fix for dropping signal, dropped calls, LTE issues, and any other cell related issues you may be having. I am not promising a miracle fix, but this should alleviate most, if not all the problems you are having. If you still are having major problems I would recommend you RMA the device after .

    I want to start off by saying you have to be unlocked. If you are not, then this will not work for you. I have included instructions on how to do this for your convenience.

    This is my first time doing this, so please speak up if you spot a mistake or have suggestions for improvements.

    DISCLAIMER: I am NOT responsible for your actions. I posted this as a guide, if you brick or blow up your phone do not come to me with blame. I will help you as best I can if you run into trouble but please read the instructions carefully before proceeding

    Please read through the instructions carefully at least twice, especially if you don't know what you are doing. While its mostly safe (as it's a Nexus device), if you miss a step you will regret it later on. Trust me, I've been there before. It's not pretty.

    Unlock your device:

    0. Backup. You can use or any other app/method you want to use. Everything not backed up will be deleted. You are going to factory reset.

    1. Install ADB and drivers. Easiest way to do this is to use . If that doesn't work uninstall everything it installs and manually download/install and . If that doesn't work, use Google .

    2. Extract the SDK you downloaded to your desktop and navigate to "sdk".

    3. Press and hold shift and right click on platform-tools. Click "Open Command Prompt Here".

    4. Boot the Nexus 5 into the bootloader (Turn the phone off and press/hold Power + Volume Up).

    5. Connect the Nexus 5 to your computer.

    6. Type in "adb.exe" in the command prompt. It should return a whole lot of crap. This means adb is working correctly.

    7. Type in "fastboot devices". This should return a lot of numbers and letters followed by "fastboot". -If it is blank or returns an error reinstall and check your drivers!!! Do NOT proceed until you get the numbers and letters which signify the device's fastboot ID. Reopening the command prompt may work.

    8. Type "fastboot oem unlock".

    9. Hit "Yes" on the phone. Your phone will factory reset, make sure you are backed up.

    10. Watch the phone. It should be doing stuff at the bottom underneath the red text. Once that is done, wait 1 minute and type "fastboot reboot". This is extremely important, make sure you do this.

    11. Your phone will reboot to the Android recovery robot wiggling his ears. Wait until the phone fully reboots. This can take up to 15 minutes. Be patient.

    12. Congratulations, you are unlocked when your phone boots. You can make sure by watching the phone when it boots. Underneath the Google logo it should show an unlocked lock.

    Installing a Custom Recovery:

    1. Boot into bootloader (Power + Volume Up)

    2. Plug phone into your computer.

    3. Download the recovery image on XDA page under downloads. I highly recommend you download CWM, but TWRP works just as well.

    4. Move the download to your platform-tools folder.

    5. Press and hold shift. Right click the platform-tools folder and click "Open Command Prompt Here".

    6. Type in "adb.exe" to ensure working adb. This is not required, but I like to be overcautious.

    7. Type in "fastboot devices". Again, make sure the bunch of letters/numbers comes up followed by "fastboot". -If it is blank or returns an error reinstall and check your drivers!!! Do NOT proceed until you get the numbers and letters which signify the device's fastboot ID. Reopening the command prompt may work.

    8. Type in "fastboot flash recovery XYZ.img. Replace XYZ with the filename of the recovery image (example: "fastboot flash recovery CWM1.5.img"). This command can take some time. Be patient.

    9. Once the command is finished close the command prompt window.

    10. In the Bootloader, using the volume keys find "Restart Bootloader". Hit the power button to select. Once the bootloader reboots find "Recovery Mode" and select it.

    11. Your custom recovery will boot. In CWM recovery go into Backup/Restore using the volume keys.

    12. Select it with the power button.

    13. Select "backup" with the power button. This ensures you have a fresh, working backup in case something goes wrong.

    14. Go to reboot phone. If the recovery warns you about something just hit yes. Seems like a common bug with recent versions of CWM.

    15. When your phone reboots head back to the recovery through the bootloader to ensure the recovery stuck. If recovery boots to an Android with an exclamation point above him you will have to repeat the recovery section.

    Flashing new Radio:

    This is the way we are going to fix your phone's dropped signal, etc. To back up the EFS partition, you need to install a custom recovery. This is very important. If you ruin your EFS partition you are royally screwed if you don't have a backup. This is unique to each device. Please look above for instructions on how to install a custom recovery.

    We will be flashing a new radio. In Laymen's terms the radio is the software that controls your cell's hardware - your signal is all regulated by this. You will be downloading all of the files from .

    Pick any of the radios. Use trial and error to see which works best for you. Some will work better for others due to carrier and location. You can use 821's files on the 820 and vice versa. Google made it easy for us.

    0. Backup EFS in either CWM or TWRP by flashing provided ZIP. Copy the folder (.zip directory - don't unzip) to a safe place on your computer. You will need this if your phone's EFS partition gets corrupted.

    1. Boot into the bootloader. (device off - Power + Volume Up)

    2. Copy the image file you downloaded into the SDK's platform-tools folder. Do not download the .zip - those are for custom recoveries. Doing it via Fastboot is much safer and Fastboot works with the image files. The image files will be larger and will be terminated with a .img file extension.

    3. Hold shift and right click on the platform-tools folder.

    4. Click on "Open Command Prompt Here".

    5. Type "fastboot devices". -If it is blank or returns an error reinstall and check your drivers!!! Do NOT proceed until you get the numbers and letters which signify the device's fastboot ID. Reopening the command prompt may work.

    6. Type "fastboot flash radio XYZ.img". Replace XYZ with radio's name (example: "flash radio IAMARADIO.17.img").

    7. Type "fastboot reboot".

    8. The phone should reboot with your new radio. Enjoy!
    Last edited by gidgiddonihah; 02-28-2014 at 02:29 PM.
    -Retired -
    8GB Toshiba Thrive
    AT&T Apple iPhone 3G
    AT&T Samsung Galaxy S2 SGH-i777

    -Current-
    Google Nexus 5 32GB Black
    Apple iPad 4 64GB Black
    JeffDenver likes this.
  2. Thread Author  Thread Author    #2  

    Default Re: Cell Signal Problem(s) Fix

    Reserved. If someone picks up a mistake please let me know. Thanks!
    -Retired -
    8GB Toshiba Thrive
    AT&T Apple iPhone 3G
    AT&T Samsung Galaxy S2 SGH-i777

    -Current-
    Google Nexus 5 32GB Black
    Apple iPad 4 64GB Black
  3. #3  

    Default Re: Cell Signal Problem(s) Fix

    I have tried all your given steps to fix my Signal Problem of Nexus 5. Now My Nexus 5 showing strong Signal Bars on AT&T Sim Card but nothing on T-Mobile or Simple Mobile Sim Card, it just has Empty Triangle. I have checked different Sim Cards. Please help me to fix this problem for T-Mobile or Simple Mobile connection. I am using Simple Mobile.
  4. Thread Author  Thread Author    #4  

    Default Re: Cell Signal Problem(s) Fix

    Quote Originally Posted by owaisian View Post
    I have tried all your given steps to fix my Signal Problem of Nexus 5. Now My Nexus 5 showing strong Signal Bars on AT&T Sim Card but nothing on T-Mobile or Simple Mobile Sim Card, it just has Empty Triangle. I have checked different Sim Cards. Please help me to fix this problem for T-Mobile or Simple Mobile connection. I am using Simple Mobile.
    Hmm. Very odd bug.

    Are those active, partitioned SIMs linked to an active account/number? Also did you backup your EFS? Make sure you move that backup folder off the device. Need to fix that on the instructions. - Done.

    Try reflashing a radio to see if that works. If not you can do a restore from the one I had you do during the rooting/custom recovery stage. If that doesn't work a factory reset may be in order. Last ditch effort is to flash the EFS backup in the custom recovery.

    Sent from my Nexus 5 using Tapatalk
    Last edited by gidgiddonihah; 02-25-2014 at 04:23 PM.
    -Retired -
    8GB Toshiba Thrive
    AT&T Apple iPhone 3G
    AT&T Samsung Galaxy S2 SGH-i777

    -Current-
    Google Nexus 5 32GB Black
    Apple iPad 4 64GB Black
  5. #5  

    Default Re: Cell Signal Problem(s) Fix

    could you explain the problems you are having with the nexus 5 cell signal? I also have a nexus 5 but i don't think i have a signal problem.
  6. Thread Author  Thread Author    #6  

    Default Re: Cell Signal Problem(s) Fix

    If a mod sees this can they move this to the Rooting, Mods & Hacks section? I was stupid and posted here by accident.
    -Retired -
    8GB Toshiba Thrive
    AT&T Apple iPhone 3G
    AT&T Samsung Galaxy S2 SGH-i777

    -Current-
    Google Nexus 5 32GB Black
    Apple iPad 4 64GB Black
  7. #7  
    anthony2558's Avatar

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    Default Re: Cell Signal Problem(s) Fix

    Quote Originally Posted by win465 View Post
    could you explain the problems you are having with the nexus 5 cell signal? I also have a nexus 5 but i don't think i have a signal problem.
    Its in the first sentence of the initial post. If your not having any of those issues then you don't need to do this.

    Sent from my Nexus 5
  8. #8  

    Default Re: Cell Signal Problem(s) Fix

    I had signal problem with nexus 5. It was working very good but couple of weeks ago all signal bars and screen just has empty triangle. thats why i used this procedure.
  9. #9  

    Default Re: Cell Signal Problem(s) Fix

    Can you make a video please?

    Posted via Android Central App
  10. Thread Author  Thread Author    #10  

    Default Re: Cell Signal Problem(s) Fix

    Quote Originally Posted by Alex Karim View Post
    Can you make a video please?

    Posted via Android Central App
    Me? I would love to if I had time. Maybe next weekend. I just had minor surgery and am on some pretty heavy medication. Probably not a good idea to post a video on YouTube right now . Plus finals are coming up in the next two weeks.

    Sent from my Nexus 5 using Tapatalk
    -Retired -
    8GB Toshiba Thrive
    AT&T Apple iPhone 3G
    AT&T Samsung Galaxy S2 SGH-i777

    -Current-
    Google Nexus 5 32GB Black
    Apple iPad 4 64GB Black
  11. #11  

    Default Re: Cell Signal Problem(s) Fix

    Quote Originally Posted by gidgiddonihah View Post
    Me? I would love to if I had time. Maybe next weekend. I just had minor surgery and am on some pretty heavy medication. Probably not a good idea to post a video on YouTube right now . Plus finals are coming up in the next two weeks.

    Sent from my Nexus 5 using Tapatalk
    Yes you in the Darth Vader mask lol. OK well I'll wait around till there's a video. I don't wanna brick my phone

    Posted via Android Central App
  12. #12  
    Axe
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    Default Re: Cell Signal Problem(s) Fix

    Pardon my confusion about the EFS backup. Maybe someone can elaborate. Backup of EFS via twrp seemed to work correctly. Here's where I'm confused: Why does each EFS backup contain a different hash? Also why does flashing the Nexus_5_Backup_EFS.zip file throw up a failed alert? At first, I thought I read something required Busybox, however installing that didn't change the flash "fail" alert.
  13. Thread Author  Thread Author    #13  

    Default Re: Cell Signal Problem(s) Fix

    Quote Originally Posted by Alex Karim View Post
    Yes you in the Darth Vader mask lol. OK well I'll wait around till there's a video. I don't wanna brick my phone

    Posted via Android Central App
    I'll get on that as soon as I can . Do you want a video of the entire process? Or just the radio?

    Sent from my Nexus 5 using Tapatalk
    -Retired -
    8GB Toshiba Thrive
    AT&T Apple iPhone 3G
    AT&T Samsung Galaxy S2 SGH-i777

    -Current-
    Google Nexus 5 32GB Black
    Apple iPad 4 64GB Black
  14. Thread Author  Thread Author    #14  

    Default Re: Cell Signal Problem(s) Fix

    Quote Originally Posted by Axe View Post
    Pardon my confusion about the EFS backup. Maybe someone can elaborate. Backup of EFS via twrp seemed to work correctly. Here's where I'm confused: Why does each EFS backup contain a different hash? Also why does flashing the Nexus_5_Backup_EFS.zip file throw up a failed alert? At first, I thought I read something required Busybox, however installing that didn't change the flash "fail" alert.
    Not sure. It worked perfectly with CWM recovery. I have never been a big fan of TWRP and don't know much about it. Give me a couple of hours and I'll do a bit of research.

    Sent from my Nexus 5 using Tapatalk
    -Retired -
    8GB Toshiba Thrive
    AT&T Apple iPhone 3G
    AT&T Samsung Galaxy S2 SGH-i777

    -Current-
    Google Nexus 5 32GB Black
    Apple iPad 4 64GB Black
  15. #15  
    Axe
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    Default Re: Cell Signal Problem(s) Fix

    Why more of a CWM fan? I'm new to TWRP as previous device recoveries were CWM-based. Haven't really used TWRP enough yet to like it any better.
  16. Thread Author  Thread Author    #16  

    Default Re: Cell Signal Problem(s) Fix

    Quote Originally Posted by Axe View Post
    Why more of a CWM fan? I'm new to TWRP as previous device recoveries were CWM-based. Haven't really used TWRP enough yet to like it any better.
    I've always felt it was less buggy and more compatible across a wider range of devices. I also like the layout much better.

    Sent from my Nexus 5 using Tapatalk
    -Retired -
    8GB Toshiba Thrive
    AT&T Apple iPhone 3G
    AT&T Samsung Galaxy S2 SGH-i777

    -Current-
    Google Nexus 5 32GB Black
    Apple iPad 4 64GB Black
  17. #17  

    Default Re: Cell Signal Problem(s) Fix

    Quote Originally Posted by gidgiddonihah View Post
    I'll get on that as soon as I can . Do you want a video of the entire process? Or just the radio?

    Sent from my Nexus 5 using Tapatalk
    Entire thing. I'm a former iPhone user who made the leap after falling in love with the nexus. I'm used to the jailbreak process which is so easy and seamless so pardon me if I ask for a lot

    Posted via Android Central App
  18. Thread Author  Thread Author    #18  

    Default Re: Cell Signal Problem(s) Fix

    Quote Originally Posted by Alex Karim View Post
    Entire thing. I'm a former iPhone user who made the leap after falling in love with the nexus. I'm used to the jailbreak process which is so easy and seamless so pardon me if I ask for a lot

    Posted via Android Central App
    Oh it's no bother. I may just find videos already on YouTube and then link them for each process until I have more time.

    Sent from my Nexus 5 using Tapatalk
    -Retired -
    8GB Toshiba Thrive
    AT&T Apple iPhone 3G
    AT&T Samsung Galaxy S2 SGH-i777

    -Current-
    Google Nexus 5 32GB Black
    Apple iPad 4 64GB Black
  19. #19  

    Default Re: Cell Signal Problem(s) Fix

    What radio did you use to improve AT&T?

    Quote Originally Posted by owaisian View Post
    I have tried all your given steps to fix my Signal Problem of Nexus 5. Now My Nexus 5 showing strong Signal Bars on AT&T Sim Card but nothing on T-Mobile or Simple Mobile Sim Card, it just has Empty Triangle. I have checked different Sim Cards. Please help me to fix this problem for T-Mobile or Simple Mobile connection. I am using Simple Mobile.
  20. #20  

    Default Re: Nexus 5: Cell Signal Problem(s) Fix

    Is it only for D820 Nexus 5?

    From my Nexus 5
  21. #21  

    Default Re: Nexus 5: Cell Signal Problem(s) Fix

    The Nexus 5, 7, 10 & will be getting the Android 4.4.3 update this month that will fix many of these issues. Rumored and expected bug changes include the fix for unstable data connections, improved camera focus, a fix for random reboot issues, missed call LED fix, Wi-Fi auto-connect fix, VPN fix, USB debugging security fix among others.

  22. Thread Author  Thread Author    #22  

    Default Re: Nexus 5: Cell Signal Problem(s) Fix

    Quote Originally Posted by normandethan View Post
    Is it only for D820 Nexus 5?

    From my Nexus 5
    You can use any radio with either model. It doesn't matter as both models radios are enclosed in a single package.

    Sent from my Nexus 5 using Tapatalk
    -Retired -
    8GB Toshiba Thrive
    AT&T Apple iPhone 3G
    AT&T Samsung Galaxy S2 SGH-i777

    -Current-
    Google Nexus 5 32GB Black
    Apple iPad 4 64GB Black

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