Develop Bugs

[Q]{SOLVED} SGH-I747 Mysterious loss of LTE Connection After Reboot/Power Cycle

Hello all,
So I have been trying to isolate this issue for 2 days now.
Basically, when coming from a fresh and clean restore of the Stock ROM (Firmware), after installing a few apps from the Play Store (Chrome, SwitchPro, Twitter and Facebook), after rebooting or powering off the phone, LTE Service stops functioning and I am stuck with HSPA+ (AT&T 4G) or less (connectivity is still automatic - e.g. calls and data still work, but LTE never returns).
I've tried several different approaches at isolating the issue, and at one point I narrowed it down to Chrome being the culprit, but then after a fresh wipe, I installed only Chrome and had no issues.
Searching around here on XDA hasn't brought me to any specifics either.
I can force LTE only via the *#2263# code, but then I lose voice capabilities.
Something is blocking LTE, obviously
At this point I have to avoid installing any of the above listed apps (particularly Chrome).
Things I've done:
Rooted
Installed CWM
Boot to Recovery and Formatted all Partitions
Entered Download Mode
Used Desktop ODIN to Restore Stock Firmware
Has anyone else been experiencing similar issues or know of a solution?
I reveted back completely from any and all root related elements to try and solve this issue but it persists
Let me know if you need more info or have any questions.
Thanks,
***UPDATE***
Issue was Resolved in Last Thread Post by me (see link below):
http://forum.xda-developers.com/showpost.php?p=31003687&postcount=6

[Moved from OP]
***UPDATE***
I conducted another test and simply after logging into my Google account on my phone and then restarting reproduced the loss of LTE.
Does anyone know how I can effectively wipe any and all device stored data from Google's servers?
I think (although I did not enable the option) my phone is pulling down corrupt device settings from the Google server.

[Moved from OP]
***CONCLUSION***
As it turned out, there appears to be a bug in the Stock ROM where even when the auto backup feature is not enable, the Auto Restore of App Data is enable and functioning regardless.
Due to an issue with a custom ROM or GApps package previously used, some incompatible Data settings somehow got associated to the Play Store app.
As well, the base version of the Play Store app in the Stock ROM is not up-to-date. So once the phone connected to the network for data, it automatically updated the Play Store and restored the bogus Data settings.
The fix involved clearing the Play Store app data and cache, and uninstalling the update as well as completely disabling all backup and restore settings in the system settings app of the phone.
Sure glad thats over now.
I hope this thread may help someone else in the future.

[Moved from OP]
***REGRESSION***
Back to square one...
Factory Reset > Boot Phone > Reboot Phone anytime during or after initial setup = No More LTE

[Moved from OP]
***POST FAILURE THOUGHTS***
At some point in time I requested the SIM Unlock Code directly from AT&T for my phone and validated unlock status with a U.S. T-Mobile SIM Card.
This is the only thing left for me to think that might have triggered these issues. That the phone (in its newer unlocked state) now defaults to HSPA+ (AT&T 4G) is what I'm thinking.
What still makes no sense to me is, why on first boot of a completely wiped and restored phone, does LTE function as expected. But, once the phone is powered off and/or rebooted, LTE disappears on boot.
Someone, anyone, help... PLEASE!!!
Screenshot_01 First Boot, LTE = Yes
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Screenshot_02 Post Reboot, LTE = No
Screenshot_03
First Boot Service Menu, LTE = Yes
Screenshot_04
Post Reboot Service Menu, LTE = No

[Success] Issues Resolved
Yesterday evening I made my way to the local AT&T Wireless store assuming I'd get my phone replaced since the issue seemed to be specific to my phone.
While at the store it was determined that I would have to go to a warranty center (a 20 min drive from where I was) that wasn't open at the time (I would have needed to wait until tomorrow/today).
So, instead we (the associate and I) tried to troubleshoot the phone in the store.
We tested my phone with one of their SIM cards, and wouldn't you know it, LTE worked fine on my phone with their SIM card.
So the associate set me up with a new SIM card, but that didn't seem to fix the problem.
So he then looked in to the settings of the phone and went ahead and toggled the Data Roaming option.
At first we didn't think this would help since I wasn't in an area where roaming would occur, but to our surprise, LTE became available.
We ran through other tests like rebooting the phone, power cycling it and factory resting the device.
All tests passed.
I still don't know what caused the issue with my phone nor how we actullay resolved the problem, but it is now gone...

[APP] [HOWTO] - How to use Google’s Android Device Manager- Htc One

How to use Google’s Android Device Manager
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Lose your Android device, either to theft or your own forgetfulness, is certainly not fun, that's what happened to my wife last month with my Nexus 7 3G. Google has finally released its response to the loss or theft of your Androphone with Android Device Manager.
It should hit your device soon, if not already, to help you locate or wipe (factory reset) your Android device lost. Here's how to use it.
INSTALL
Click to expand...
Click to collapse
Android Device Manager will automatically hit your device without having to do a thing. If you don't have it yet, you will soon receive. But before you can take full advantage of ADM, you will need to do some things, such as allowing factory reset on your device. Its implementation is quite simple..
First, visit google.com/android/devicemanager.
and if you want you can download the apk => com.google.android.gms-1.apk - MD5 Sum: d1884b750aff2dc3ff435f95510420cb - Size: 7.30 MB (7649893 bytes)
From there, a map will pop up with some information about your device, along with a prompt to enable the Erase Device function of ADM. You can either manually open up the green Google Settings app, which should be in your app drawer, or use the send notification link on the ADM webpage, giving you an easy way to find exactly where you need to be to enable remote factory reset.
If you don’t use the notification, just open Google Settings, and select Android Device Manager.
The option to toggle both the ability to factory reset your phone from ADM, and locate it, will be in there.
Using ADM
Click to expand...
Click to collapse
After you’ve done that, you’re ready to set to go. At the moment, there are three main functions of Android Device Manager. You can ring a lost phone, factory reset a lost phone or locate your device on a map using your phone's GPS. You can also rename what your device appears as in ADM.
Simply you can load ADM online and will show you the location of your device, but if you’re tracking it while it’s on the move, there’s a refresh button that will recalculate your device’s location.
If your device is located somewhere simply, like in your own house, you may want to use the Ring function. As Google explains, even if your phone is on silent, using the ring function in ADM will force your phone to ring at full volume for five minutes. To turn it off, you have to press the power button on your phone.
There’s nothing on your device indicating why it’s ringing, you’d have to know how to stop the ringing or play around to figure it out.
If you believe your device has been stolen, and you have some precious information on it, then the Erase Device function will come in handy. After you click Erase Device, a pop up will tell you what it will erase (essentially everything), and what will happen after that.
Unfortunately, Google says it “may not be able to wipe the content of the SD card in your device.” Best of luck if you have anything private on there.
If your device is off when you try to factory reset it, have no fear. The moment it’s turned on, it will be erased.
You may think erasing the content of your device is the best thing to do as soon as you find it’s missing, but you may want to hold on. After you erase your device, ADM will not work anymore.
Conclusion:
Click to expand...
Click to collapse
For the moment, that’s all there is to it. As with all of Google’s products, we expect to see more features added in time and more practice
Thanks to Androidandme

I'm sticking with cerberus for a while. But I guess ADM may become even better in a few months
Sent from my HTC One using xda premium

I wish there was an option to set a pin on the phone remotely.

When I login to android device manager web site, how come my phone was not listed there?

Sorry If I'm asking this Question in the wrong section but whenever I locate my device, ADM send a notification to my device which seems to be quite silly as if my phone is stolen, the thief will be able to see this notification and may turn off ADM completely. Any suggestions to turn off the notifications??
I've already remove ticked from show notifications by going to Settings =.> Apps... that didn't work out

Does anyone ever have problems wiping?

Whoa! That topic title :laugh:
When I go to wipe my phone, often I find, after I reinstall my factory image, the device still remembers my wifi password. Even after doing the following...
Wiping with recovery (data, cache, davlik)
Wiping with Jellybean Format All X2
Wiping with stock recovery (data and cache)
Even with all that, I still find, sometimes, my device remembers my wifi, which leads me to believe it never was fully wiped.
Any suggestions to ensure a proper wipe?
Thanks.
EDIT: I've been messing around with it a bit more, and now I don't think the problem is the password being remembered.
When I flash back to factory using Samsungs Simple Drive, typically, when you go to re-configure the phone, you're immediately prompted for a wifi password upon setting up e-mail.
I found, half the times I wasn't prompted for an e-mail pass, which led me to believe my wifi pass wasn't getting erased.
Now, I think the reason I wasn't getting prompted for my wifi pass, is because it was connecting to the cellular broadband, which must be the reason I wasn't getting prompted for a wifi password.
I just tried it, after not getting prompted for my wifi pass, and sure enough I had a real slow connection with the web browser. Then I clicked on my wifi router in settings, and was prompted for a password.
Strange thing is, I'm using Freedompop as my provider, yet getting an internet connection without their app being installed. I even tested the connection with the Speedtest app and was getting 1.3 mbps down and .58 up. I guess with Fredompop, you're connected to data even without thier app installed.
I tried making phone call without the app installed, however that did not work.

FreedomPop's app only controls messaging and phone calls, not the data connection. After a factory reset I'm guessing you allow Google to restore your settings, which includes Wi-Fi passwords. What you are doing is a proper wipe.
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bilgerryan said:
FreedomPop's app only controls messaging and phone calls, not the data connection. After a factory reset I'm guessing you allow Google to restore your settings, which includes Wi-Fi passwords. What you are doing is a proper wipe.
Click to expand...
Click to collapse
What I seemed to figure out, is that after a wipe, I can connect to the internet via mobile data, which is why I was probably not being prompted for my wifi password.
I confirmed this by doing a wipe, then immediately connecting to the internet via 3g. Then I confirmed I wasn't connecting via wifi, since I tried to connect to my router in settings, and was prompted for a wifi password. So, right there, I know my wifi password wasn't being stored by google, since it was prompting me for a password.
I guess when you have service with Freedompop, you can connect right to the internet straight after a wipe. I always thought you needed thier app installed first. But, like you stated, the app is only for messaging and calls.

copota said:
What I seemed to figure out, is that after a wipe, I can connect to the internet via mobile data, which is why I was probably not being prompted for my wifi password.
I confirmed this by doing a wipe, then immediately connecting to the internet via 3g. Then I confirmed I wasn't connecting via wifi, since I tried to connect to my router in settings, and was prompted for a wifi password. So, right there, I know my wifi password wasn't being stored by google, since it was prompting me for a password.
I guess when you have service with Freedompop, you can connect right to the internet straight after a wipe. I always thought you needed thier app installed first. But, like you stated, the app is only for messaging and calls.
Click to expand...
Click to collapse
Yeah once you update your Profile and PRL to FreedomPop you are all setup on their network. It's been a different experience for me too, they aren't like other carriers.

Nexus 5X - 'Software exception' after 7.0 update

So my Nexus 5X prompted me to download the system update this morning. Everything went as normal, but after it had finished I now get 'Software Exception' constantly popping up on the screen around 30 seconds after the phone has booted. The message appears for a second, disappears, reappears, etc.
I turned the phone off and tried to go into recovery mode, but now instead of my usual recovery options I just get a screen with an exclamation mark that says 'No command'.
Can anyone help? Thanks

BurnCK said:
So my Nexus 5X prompted me to download the system update this morning. Everything went as normal, but after it had finished I now get 'Software Exception' constantly popping up on the screen around 30 seconds after the phone has booted. The message appears for a second, disappears, reappears, etc.
I turned the phone off and tried to go into recovery mode, but now instead of my usual recovery options I just get a screen with an exclamation mark that says 'No command'.
Can anyone help? Thanks
Click to expand...
Click to collapse
What is you see is the usual recovery screen. You are supposed to press and hold power + click volume up for recovery screen and then release power.
I cant understand what is software exception screen. Not seen in my life. Clearing cache might help.

I don't remember having to do power and volume up before, but thanks that worked to get me in.
I cleared the cache but still getting 'Software exception' flash up every other second.
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Factory reset appears to have cleared the message

I'm having the same issue on my Nexus 5X. Started immediately after upgrading.

BurnCK said:
Factory reset appears to have cleared the message
Click to expand...
Click to collapse
Oh joy. A factory reset is precisely why I avoided unlocking/rooting this thing, and now I have to go through it anyway. Ugh.

(Solved by Service center)Device boots to Options Menu and auto scrolls through the o

Hello,
I have an OnePlus 3 (Indian Version). I was using Flyme OS 6 (here).
Everything was going great until few days back. I wasn't getting signals and so I restarted the device. But it entered the Options menu and the selector(Blue colored) auto scrolls through the options continuously.
There are these options:
Power off
Restart
Recovery
Fastboot
Back to previous page
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Video showing the Auto Scroll.
After almost 40-45 mins the selector stopped at 'Fastboot' option and I booted into it. Even here the options auto scrolled from Start to Recovery to Power off and again same. Yet I booted into Blue Spark TWRP via Terminal using fastboot command and tried flashing Flyme OS again and even Open Beta Zip. The flash finished sucessfully but the device again booted into options menu.
I have even tried both methods 1 and 2 from here and that also went fine but still the same issue.
I am hoping someone can help before I go to the Customer Service Reps as the nearest Service center is ~250KMs from my home town.

did you solve this issue? seems like the volume button is stuck.

rirozizo said:
did you solve this issue? seems like the volume button is stuck.
Click to expand...
Click to collapse
Still stuck there.
I am able to boot into QUALCOMM 9008 mode to use the Msm tool. If Volume (probably -) key is stuck than I must not have booted into QUALCOMM mode. Correct me if am wrong.
Also if the case actually is so, then is there a way to fix it by my own?

arnabJ said:
Still stuck there.
I am able to boot into QUALCOMM 9008 mode to use the Msm tool. If Volume (probably -) key is stuck than I must not have booted into QUALCOMM mode. Correct me if am wrong.
Also if the case actually is so, then is there a way to fix it by my own?
Click to expand...
Click to collapse
I just rebooted to see that if I held my volume down button, do I get the same scrolling effect as yours.
It turns out I have the exact same effect as yours with the sane scrolling speed, which indicates that your volume down button is stuck.
I guess you can blow some air into the rocker or do something to set it free.

rirozizo said:
I just rebooted to see that if I held my volume down button, do I get the same scrolling effect as yours.
It turns out I have the exact same effect as yours with the sane scrolling speed, which indicates that your volume down button is stuck.
I guess you can blow some air into the rocker or do something to set it free.
Click to expand...
Click to collapse
Thanks for doing so much just to help me.
I can hear the Click when I press the volume down button yet I will try to blow some air and see again.
Edit: I tried but still same. Pressing up button moves the selector up once and then again auto scroll continues.

At last I took the device to Service center and they fixed it via a firmware flash. I don't know if they did just that but that's what they said.