Develop Bugs

Cosntant Signal(Voice and Data) Loss

Some weeks ago i acquired this device that i have been following for some time ago, i have a problem that i never seen before on Android and there is close to nothing documented about what to do, i will try the scenario the simplest as possible:
1. The phone is an Huawei Ascend P6-U06, in the back of the phone the letters are in Chinese (i don't knows if that matters actually)
2. The phone works with a 3G SIM (Digitel Venezuela), this carrier also provides 4G-LTE network.
3. The phone is unlocked and actually gets H+ data connection.
4. The problems came when from time to time (1min ~ 30s) the signal is completely lost, voice & data, and it came back after ~15s or so. Is like i set it on and off Airplane mode. This is a non-stop loop that drains the battery.
Notes:
A. If device is plug to any power source, the connection is stable.
B. If exist an active connection (like an Play App Download), the device won't lost the signal until the download ends, independently if the downloads is 30 mins or more .
C. I have tried with other ROMs, officials : B108-B113, B512, B513, B634, B635 y B708, also with non-officials ROMS like: CM10, CM11, MIUI6.
Workarounds tried (fails):
i. Set "WCDMA Only" using service menu *#*#4636#*#*, i read it on a Nexus forum that it presents the same failure on ROMs based on 4.3 & 4.4, It says it was a framework/hardware issue. But in my case, the phone reset itself to "WCDMA Preferred". (While is it WCDA Only connection is stable), also tried directly set it to SQLite DB, but doesn't worked.
ii. Also tried with the project menu *#*#2846579#*#* doing the 3-steps method mentioned on a website (i can't share links yet), in the final step says "Network mode set Failed".
iii. Doing a Ping every second to Google through a virtual console keep the connection up and make it more stable (like 80% of the time is up), but the battery get drain fast (without mention data consumption).
Any other details that i should provide, please guide me and i will send it over to you,
Thanks in advance,

Try a sim card from a diferent mobile operator and see if it behaves the same.
Sent from my SM-G850F

tileeq said:
Try a sim card from a diferent mobile operator and see if it behaves the same.
Sent from my SM-G850F
Click to expand...
Click to collapse
Yes, i have tried with others SIM cards and another carriers, it behaves the same (or worst, in some case just get 2G).

Had the same issue with my phone. For me it was A hardware defect which was repaired under warranty.
Verstuurd vanaf mijn Nexus 5X met Tapatalk

HELP!!!! WiFi connection unstable and SDCard unmounting automatically

Hi All,
I own a LG G3 for past 1 yr and 4 months. Every thing was fine until last month when I accidentally dropped my phone and the display cracked. Of course, touch did not work. So last week I went to an authorized LG service center to change the whole display (which involves the process of taking out the motherboard and fixing it with another display. This means the whole frame is changed). He did this process in front of me only. After the change, everything works well except for a weird WIFI problem which I never faced before the screen was replaced.
The WIFI would frequently connect and disconnect. Even in the search list, all the SSIDs would be shown occasionally and sometimes won't show up at at all. Note again, this happens with all the potential WIFI connections around, Not only with mine. In short, the WIFI search results list won't be stable.
Even if my WIFI shows up in the list and I try to connect it will show - "saved"/"disconnected"/"Disabled" status. And yes, occasionally my WIFI gets connected and internet starts working. But not for too long. Prolly the connection lasts for 5-10 mins or so. All my other devices connect using the same AP and so i don't really have a doubt on my router AP.
I visited the authorized service center again. Without even having looked at the problem he says motherboard might be the problem, and asked me to change it. Even if i persist him to have a look at the problem, he won't . My last resort is XDA
The ways I tried.
1. Factory reset.
2. Flashed roms 21A and 20P (from scratch, erased all data and caches). Still No joy.
3. Tried forgetting the network and connecting again.
4. Toggle WiFi on and off
P.S : I also have another problem of SD card getting unmounted automatically and an error message pops up as "SD Card removed unexpectedly. Please unmount SDCard before removing to prevent", but immediately a toast message comes as SD card inserted. xx.xx GB space available. This keeps on happening in a loop until SD Card wouldn't show up in File manager at all. But, this problem was there for a long time even before the screen was replaced unlike the WiFi
problem which occurred only after the screen is replaced.
I really don't know what exactly is going on with my phone. Please let me know if any of you are familiar with these problems and have solved it. Would really save a huge money for me

Galaxy S7 Active 6.0.1 and problem with DATA on EU SIM cards

Hello all!
I bought this phone from an eBay seller and the phone was unlocked and is still on OFW 6.0.1 and im really satisfied with this phone in general. However, there are some issues with DATA connection (European SIM cards atleast) but im not sure who is actually to blame, the actual phone and its "network capabilities" or some specific apps?
Example, at first there were no issues connecting my phone to internet, using Firefox and for example launching pokemon go and loging in but after some time, I cant load any websites or login to pokemon go.... it just stucks, no error message (no data message or something similar) but nothing will show up/load from internet, it seems as it just keeps loading and loading without any success.........

deSSy2724 said:
Hello all!
I bought this phone from an eBay seller and the phone was unlocked and is still on OFW 6.0.1 and im really satisfied with this phone in general. However, there are some issues with DATA connection (European SIM cards atleast) but im not sure who is actually to blame, the actual phone and its "network capabilities" or some specific apps?
Example, at first there were no issues connecting my phone to internet, using Firefox and for example launching pokemon go and loging in but after some time, I cant load any websites or login to pokemon go.... it just stucks, no error message (no data message or something similar) but nothing will show up/load from internet, it seems as it just keeps loading and loading without any success.........
Click to expand...
Click to collapse
any solution to this problem?

SIM card recognized but no service

TL;DR
Moto Z2 Play - XT1710-07
The phone recognizes the SIM card but there is no signal (no service). Tried several things, including flashing a custom ROM. I'm considering buying a new motherboard and changing it myself, but first want to know if anyone knows more about this issue or has an idea/suggestion.
Edit: As an added bonus, something that only now I realized. Now when I charge it, it gets EXTREMELY hot. Like I-can't-even-use-it hot. I used to use the phone while charging all the time, but now I can't even hold it. Seems like the problem is when it tries go past 80% charge. It gets super slow, keeps trying and gets hot. Now I don't know if it's a software problem caused by the various flashings or if it's something that would remain even after swapping the motherboard.
Edit 2: I did a full discharge of the phone and recharged it while turned off. It seems to have normalized the battery problem
Edit 3: RIP. I tried to remove the screen before deciding about buying a new board. In the process, I ended up tearing the digitizer flat cable apart. Now I don't think it's worth it buying both a new screen and a motherboard.
The full story and things I've tried
My phone was working all nice and dandy until it stopped having signal/service. Wifi works normally, but anything related to the SIM card doesn't, like phone calls or mobile data.
A list of things I've tried somewhat in order (both of time and of complexity):
* My SIM in another phone: it works normally, so the problem is not the SIM itself
* Another SIM in my phone: it doesn't work, so the problem is definitely the phone
* Using the second SIM slot
* Changing "Preferred Network Type" between the available ones (4G, 3G, 2G, including Enhanced 4G LTE Mode on and off): this one and the next two items don't really make sense to me, since these options seem to be only related to mobile data (4G/3G internet) connection, not to phone calls which is also not working, but I tried them anyway
* Manually selecting the network: Errors with "Selected network unavailable" and, after trying to register for a while, toasts another error saying "Can't connect to the network, try again later"
* Manually selecting the APN: Tried both selecting between the two options available and manually adding an APN by googling the correct info for my carrier
* Simply booting into fastboot and restarting bootloader: a video on YouTube claimed that it was a temporary solution and that I'd need to do it every time it lost signal. But it didn't even work the first time
* Disabling CQATest and then restarting bootloader (and also clearing its data/cache and removing its permissions): a lot of videos on YouTube claimed this was a solution, including for other Motorola phones. Apparently CQATest prevents the phone from working properly in some scenarios. But I think only when you de-google your phone? Not sure. All I know is that it didn't work either
* Using the phone connected to the wall charger: I think this was another YouTube suggestion, and it actually worked for a few minutes. But I guess it was just a coincidence, as it never worked again
Now for some more... "forceful" attempts:
* Factory Reset: Not sure where I saw this suggestion, but it was pretty much the next logical step. Gathered courage, backed up all my data, etc, aaand... nothing again
* Flashing another ROM: Guess it was here at XDA that I read that it was a problem with Motorola's stock ROM. That, paired with my belief that it could still be related to CQATest being installed, I again gathered more courage to flash a custom ROM. I chose LineageOS and found out that it was no longer supported, but decided to install the last official release. I also read that the problem was the Pie modem firmware, so it all seemed to be going fine since the last official release is Oreo 8.1. I flashed it and BAM it worked! ... for a few minutes and never again. I messed around with LineageOS, tried some of the previous things again, but nothing.
Then, I tried to restore my TWRP backup but it didn't work. So I searched a bit more and downloaded the Stock Pie ROM, flashed it, and closed the bootloader. And then I realized the restore probably didn't work since my backup was made using Pie and my phone was on Oreo. Maybe some files/partitions were missing? Also, when I was creating my TWRP backups, I tried creating a full system image backup but it kept erroring. Only later I realized the problem was that the USB Drive was FAT32 and the full system image was bigger than 4GB. Oh, well, now I know.
So now that I'm with my phone pretty much back on square one, I take it to an authorized repair shop. The clerk said that it was a common problem, and that sometimes it could be solved "by software" and that they'd try that. The other option was to change the whole motherboard, which they didn't do because it was "not worth it" and "almost the full price of a new phone". After two days, my suspicions were confirmed: they didn't fix it with their "by software" attempt. At least I didn't have to pay anything.
When I got the phone back, I put the SIM in again and it showed the icon as if there was signal. But when I tried to call someone, the signal disappeared again. I tried searching a bit more, went through all pages of Q&A here at XDA forums and there were like 3 posts regarding loss of signal. All without any response. On YouTube, I found some videos offering a suspicious .bat file. Upon inspection, it merely erased the modemst1 and modemst2 partitions and then wiped user data and cache. I tried it, nothing to lose. Also didn't work.
Now I'm contemplating a few options:
By watching some disassembly videos, I saw that, when opened, the phone has some parts that act like antennas. I thought that maybe those were not properly connected to the board? Maybe they got dislodged during a fall? Seems unlikely tho, since they are screwed in. I searched for a new motherboard to buy and it's a reasonable price. But I'm afraid it'll have the same problem (or develop it in a short time) since I can't find anywhere what the true cause of the problem is.
Another option is to just give up, buy a new phone and use this one as if it was a "small tablet" lol
So, do you guys have any other suggestions or ideas as to what might be the problem? Maybe a tip like "solder a wire to this spot to create a make-do antenna"? I don't really know where else to search.
If not, thanks anyway for those who read it all

Question SM-F926U1 no longer seeing/using SIM card?

Hi everyone, just a little curious on what side of the old "metaphorical" coin my phone has fallen on. The problem this coin is concerning, is simply one related to my SIM. My phone has no cell service right now since it doesn't want to acknowledge or use the sim card it has in it. It's a 512Gb unlocked phone I special ordered upon first release, no other problems (other than the screens scratching easily) but now it's no longer working on anything other than wifi. It's the wifi that I think caused this problem actually. I just set up a new lightweight Asus RT-AX56U router to utilize two WAN ports (one built in and the other setup through a USB ethernet adapter). The problem came about after I switched down to a WPA3/WPA2 setup from a full WPA3 simply due to a connection problem one of my laptops was having (it's wifi card was one from prior to WPA3). Shortly after I did that my Z Fold 3 started having frequent wifi drop problems. After about an hour of that the connection seemed stable, then the next thing I know the phone dropped connection to both Wifi and cell network! Then after I restarted the router, only wifi would reconnect and my cell network connection has been M.I.A. ever since despite what I do (tried airplane mode, tried cache whipping it, restarting it, and finally even a full factory wipe/restart). My phone is up to date on all of it's updates (finally decided to last month after seeing that my model has no root + camera options) but nothing other than a routen cache cleaning ever happened to it prior. Just trying to figure out what my next move now should be, get a new SIM card, or is a whole new phone needed?

I would first try another sim card to see it's related to the physical card or a carrier issue. Maybe try and borrow one from another network as well.
If that fails, try a factory reset.
If that fails, it's time to reach out to Samsung.

I tried a different SIM from a different phone from the same provider (on the same contract bill). But it wouldn't register, I even factory reset it prior to trying the other SIM. So I went and got a new one from the carrier, and problem solved! (First SIM card I've ever burned out without truly trying to)