Database Users

Not Registered on Network

Hi guys,
I recently picked up a used S4 on Craigslist for cheap because the guy "screwed up" using Odin and flashed something that caused his phone to not register on any networks. I figured, what the hell, it's cheap enough and I might be able to restore it. So far I've restored the Rogers firmware over Odin and tried installing a custom rom/recovery too. I'm still getting this problem unfortunately. The IMEI reported with *#06# and in the status screen does match the sticker on the inside of the phone.
So I'm sure everyone's going to suggest that the phone was stolen and the IMEI has been blacklisted. My provider (Fido/Rogers) apparently doesn't care if the IMEI is blacklisted, they'll let it run anyway. I called up Fido anyway (since I'm a Fido customer) and asked them about the IMEI of this phone and they say they don't have any record of anyone calling in reporting it stolen and they don't have an IMEI database so she didn't have much to say about it.
Does anyone have any other suggestions? I've also flashed just the kernel, and I will flash a modem onto it too. I know my SIM card works, and both my SIM card and the last owners SIM cards don't work. I know the radio works because it picks up the emergency signal fine, and the SIM tray isn't damaged because when I put in my Fido SIM the Fido APN's automatically come up, as well as the lock screen goes from "No SIM inserted" to "unregistered SIM." Could my EFS partition be borked? Wifi works and IMEI shows up correctly.
The buyer said he would take the phone back if I can't fix it, but I want to try a bit more before I give up. If anyone has any ideas or suggestions, that would be great. Thanks a lot in advance XDA!
Summary:
-Used S4
-Owner flashed something wrong in Odin
-Gets "Not registered to network" error, unregistered SIM error
-Tried restoring
-Tried new ROM/Recovery
-Carrier says IMEI is fine, also tried directly registering the IMEI to my account
-IMEI is correct in settings/sticker on back of phone
-Wifi/everything else all works

Sounds like it's SIM locked to a different network. Try the the guide here: http://forum.xda-developers.com/showthread.php?t=2285431

MatinatorX said:
Sounds like it's SIM locked to a different network. Try the the guide here: http://forum.xda-developers.com/showthread.php?t=2285431
Click to expand...
Click to collapse
My girlfriend has a Bell sim, which when we insert, gives us the "Please enter unlock code" screen.
My sim does not do that. I know this device is for my carrier, but I figure the easiest way to get this going is to just unlock it and see if the problem persists on other networks.
I've tried that unlock tutorial before. The first time I tried it, when I just got the phone from the previous owner, it said "Golden-backup does not exist" so I couldn't do the restore step of that guide. After Odin-flashing everything and starting over, I can't even get into the UMTS menu anymore! I'll try another restore and give it another go though.
Edit: Another problem. I did a restore again using Odin and notices that it never properly wipes the phone. When I finish flashing, my Wifi still autoconnects on first boot, and every few seconds, a process crashes causing the phone to freeze. Has anyone heard of this kind of problem before?

Quick update:
Managed to Odin-flash it to the earliest firmware I could find for the phone without any crashing or freezing problems. Trying to do the network unlock method mentioned online. It does not work, even though I'm following the instructions to a T. Could it be that my EFS partition is borked and that the NV rebuild can't happen, meaning my radio configuration would also be borked?
Edit: Oh and when I booted up my phone for the first time, the phone was actually ON Fido! But within a few seconds, it went back to "Emergency calls only."

Hmm, that is some odd behavior, and definitely not a carrier lock. Shame it's never that simple to fix.
Not quite the same as your issue, but I lost my ability to make and receive calls after flashing a newer modem on an AOSP firmware. Flashing custom kernels, older modems, the latest stock rom and kernel were no help at all. I tried everything I could think of short of groveling. In the end the only way I got everything working again was to flash the original factory firmware my phone shipped with, factory wipe it from stock recovery, then flash it again. If you've already tried that (and I'm guessing you have), consider contacting Samsung regarding warranty. They've been really good to me in the past, even with second-hand phones.
I can confirm that Odin doesn't clean everything out. In my trials I also noticed that flashing via ODIN without a factory reset presented no setup wizard, caused lots of FC's and left some previous files hanging around.

Sounds like a bad sim tray.
Sent from my SAMSUNG-SGH-I337 using xda premium

make sim fit tighter
graydiggy said:
Sounds like a bad sim tray.
Sent from my SAMSUNG-SGH-I337 using xda premium
Click to expand...
Click to collapse
I had trouble with my handset after it got run over in the street, making it's otterbox earn it's money. The only bad symptom after that episode was Emergency calls only kept recurring.
I cut a tiny square of transparent scotch tape, avoided touching the sticky side, and placed it squarely on the SIM chip's backside, to make it fit the sim slot more snugly. It sounds like you should try stacking two or three layers on your chip as it sounds to be more loose than mine is.

Hi everybody! Thanks for all the help trying to fix it! It ended up being that the guys the previous owner had unlock it used the debug-menu unlock method and my phone was one of the ones that doesn't accept it. Lots of other people complained about similar problems as me in the free unlock method thread. In the end, I paid for the FastGSM USB Unlock method and it fixed the problem.

OH MY GOSH YOU JUST SAVED ME from buying another phone!! THANKS so much.. I added 3 layers of tape on the back of my sim and it works!!! weird.. cause I have the Dual Sim.. and it was the first sim that would not work. the second sim was fine.. anyways.. THANKS SO MUCH!!

[Q] recently unlocked S5 can't register to any networks

Hello, I've had my s5 for a while on a Vodafone contract with no problems. The phone was rooted and had a custom recovery. I recently got it unlocked from a local shop due to moving contracts and now since then the phone will not connect to a single network. I have tried 3 different sims from different networks and all the same result. I flashed to stock again and no help. My device status reads:
Network: unknown
Mobile Network type: unknown
Service state: out of service
Mobile network state: disconnected
Phone number and IMEI are correct.
Dialling *#06* shows my correct IMEI. I can't get into any service menus due to no root now, and my EFS folder appears empty
Any help will be useful, thank you

Was root broken by the unlock? A SIM unlock shouldn't break root. First try wiping your system cache from recovery mode. If the problem persists, then your best bet would be to restore your backup which will certainly resolve your issue and let you proceed from a stable position. If you don't have a backup, what the hell? Why wouldn't you be making backups?
As (a much less desirable) alternative, make a backup at this point or at least save any important files or photos. Then temporarily install a 100% stock ROM followed by a factory data reset. This is to rule out software issues other than EFS. If your phone now works, then it was a matter of a broken root or conflicting settings.
If you still have problems, then you need to provide a lot more information if you want good advice. We can't see your handset so if you don't give us a lot of details all anyone can do is flail around in the dark and make guesses. Try your SIM card in another unlocked phone to confirm that it still works. Confirm that you wiped your system cache and tried a factory data reset. And tell us step by step what you've tried so far.
.

fffft said:
Was root broken by the unlock? A SIM unlock shouldn't break root. First try wiping your system cache from recovery mode. If the problem persists, then your best bet would be to restore your backup which will certainly resolve your issue and let you proceed from a stable position. If you don't have a backup, what the hell? Why wouldn't you be making backups?
As (a much less desirable) alternative, make a backup at this point or at least save any important files or photos. Then temporarily install a 100% stock ROM followed by a factory data reset. This is to rule out software issues other than EFS. If your phone now works, then it was a matter of a broken root or conflicting settings.
If you still have problems, then you need to provide a lot more information if you want good advice. We can't see your handset so if you don't give us a lot of details all anyone can do is flail around in the dark and make guesses. Try your SIM card in another unlocked phone to confirm that it still works. Confirm that you wiped your system cache and tried a factory data reset. And tell us step by step what you've tried so far.
.
Click to expand...
Click to collapse
Thanks for the reply, I will describe as best I can what is happening:
Firstly as the phone rebooted from the unlock I could not register to any networks. Root was still there and TWRP also . I restarted the device, and nothing happened. So next I tried a different aim and still I have no network. Both aims work in another phone. I did what you mentioned next and restored a backup and still no fix.
I tried factory resetting and wiping the cache and again, no fix. Then I flashed the stock firmware through ODIN which had no effect either.
If I use the sim in another handset then return to my s5 with it on first boot up it registers to EE and pulls a signal with no Internet, then quickly unregisters to emergency calls only.
Thank you for your help, I will give any info about the device that you need.

fffft said:
Was root broken by the unlock? A SIM unlock shouldn't break root. First try wiping your system cache from recovery mode. If the problem persists, then your best bet would be to restore your backup which will certainly resolve your issue and let you proceed from a stable position. If you don't have a backup, what the hell? Why wouldn't you be making backups?
As (a much less desirable) alternative, make a backup at this point or at least save any important files or photos. Then temporarily install a 100% stock ROM followed by a factory data reset. This is to rule out software issues other than EFS. If your phone now works, then it was a matter of a broken root or conflicting settings.
If you still have problems, then you need to provide a lot more information if you want good advice. We can't see your handset so if you don't give us a lot of details all anyone can do is flail around in the dark and make guesses. Try your SIM card in another unlocked phone to confirm that it still works. Confirm that you wiped your system cache and tried a factory data reset. And tell us step by step what you've tried so far.
.
Click to expand...
Click to collapse
Thanks for the reply, I will describe as best I can what is happening:
Firstly as the phone rebooted from the unlock I could not register to any networks. Root was still there and TWRP also . I restarted the device, and nothing happened. So next I tried a different aim and still I have no network. Both aims work in another phone. I did what you mentioned next and restored a backup and still no fix.
I tried factory resetting and wiping the cache and again, no fix. Then I flashed the stock firmware through ODIN which had no effect either.
If I use the sim in another handset then return to my s5 with it on first boot up it registers to EE and pulls a signal with no Internet, then quickly unregisters to emergency calls only.
Thank you for your help, I will give any info about the device that you need.

SIM card not detected

I moved my T-Mobile SIM card from my Nexus 6 to my never used, eBay purchase, 6p. The 6p does not detect the SIM card. I reinserted it multiple times with no luck. I don't know if it matters that I installed TWRP, Nitrogen ROM and Franco kernel, without the SIM in the phone?
The phone is otherwise fully functional.
Any ideas on what might be going wrong? The package slip that came with the 6p states, "Tested for Key Functions, Ready for Resale". I've contacted the seller for advice.

msmcintosh said:
I moved my T-Mobile SIM card from my Nexus 6 to my never used, eBay purchase, 6p. The 6p does not detect the SIM card. I reinserted it multiple times with no luck. I don't know if it matters that I installed TWRP, Nitrogen ROM and Franco kernel, without the SIM in the phone?
The phone is otherwise fully functional.
Any ideas on what might be going wrong? The package slip that came with the 6p states, "Tested for Key Functions, Ready for Resale". I've contacted the seller for advice.
Click to expand...
Click to collapse
Probably should of checked it out before loading a custom ROM. That being said if the ROM is 8.0 I don't think the first version of the update is compatible with T-Mobile.
"8.0.0 (OPR6.170623.013, Aug 2017, Not for TMO/USCC/Fi)"
You should maybe try a stock ROM first. Get nexus root kit. There is an option to revert the phone back to stock. Might help.
Just a shot in the dark. May also be locked to a region. Good luck though.

I reinstalled stock Oreo. Now, I'm only seeing "No Service". I don't know if this is of significance, but when I check Settings - > System - > About phone - > Status, SIM status everything is blank. At least the SIM was detected. I didn't realize when I installed stock Oreo it would wipe out my SDcard.
The vendor image is used with Nitrogen was opr5.170623.007.img.

And I suppose the sim works in other phones?
It's hard to say what is going on. May just be in backwards?
Aside from the bootloop and battery issues the 6p has been awesome as far as loading ROMs. You never have to replace the bootloader so even if you break the recovery it can be fixed easily. Not the same for my sapphire unfortunately.
Anyways I would first say it may be a physical issue, Especially if the sim says it's blank. Again, good luck.

I believe it's just Android 8 and not the phone. Go through any 6p Oreo thread and will find one person with this problem. Solutions that where posted fingerprint/pincode security off before flashing, no encryption on first boot and solution that worked for me complete wipe of phone flashing stock Oreo. I haven't heard any direct answer on what the cause is and I think the first 2 solutions worked for people because they did a clean flash of stock Android 8 anyways.

Yes, the SIM works fine in my Nexus 6. I noticed under SIM status, it lists "No signal".
I installed the factory Nougat ROM and still no service.
Under SIM status in Settings, Network is Unknown, Signal strength is 0, Cellular network type is Unknown and Service state is Out of Service.

msmcintosh said:
Yes, the SIM works fine in my Nexus 6. I noticed under SIM status, it lists "No signal". I installed the factory Nougat ROM and still no service. Under SIM status in Settings, Network is Unknown, Signal strength is 0, Cellular network type is Unknown and Service state is Out of Service.
Click to expand...
Click to collapse
Is your IMEI field blank too in Settings? If the phone does not have an IMEI, the device may have corrupted EFS partition(s). Boot the device to bootloader (fastboot mode) and select "Barcodes". Is your IMEI there? Is your model a H1511 (US model)?
Put a known working SIM in the phone from a different carrier (preferrably not an MVNO), If that doesn't work, since your phone is new (to you) there is no harm in fastboot formatting these 3 partitions (system, cache and userdata) and then using the Google script (batch file) that comes with a full factory image. Not a factory reset, not manually flashing a ROM. One other possible scenario is that if the phone was previously used on ProjectFi, you may need to contact Google and have your phone's IMEI de-registered. Hopefully you get it working and won't be forced to return the phone.

v12xke said:
Is your IMEI field blank too in Settings? If the phone does not have an IMEI, the device may have corrupted EFS partition(s). Boot the device to bootloader (fastboot mode) and select "Barcodes". Is your IMEI there? Is your model a H1511 (US model)?
Put a known working SIM in the phone from a different carrier (preferrably not an MVNO), If that doesn't work, since your phone is new (to you) there is no harm in fastboot formatting these 3 partitions (system, cache and userdata) and then using the Google script (batch file) that comes with a full factory image. Not a factory reset, not manually flashing a ROM. One other possible scenario is that if the phone was previously used on ProjectFi, you may need to contact Google and have your phone's IMEI de-registered. Hopefully you get it working and won't be forced to return the phone.
Click to expand...
Click to collapse
Barcodes shows IMEI present and model is H1511. I ran the script in the full factory image for Oreo and then tried the same with Nougat. I didn't reformat the partitions prior to flashing ROM. Is this important or does the factory image replace them anyways?
I don't have access to another carriers SIM card.

msmcintosh said:
Barcodes shows IMEI present and model is H1511. I ran the script in the full factory image for Oreo and then tried the same with Nougat. I didn't reformat the partitions prior to flashing ROM. Is this important or does the factory image replace them anyways? I don't have access to another carriers SIM card.
Click to expand...
Click to collapse
The script uses fastboot erase which does not format the partitions. Formatting returns partition information, any errors and in some cases corrections. You did not mention IMEI within settings, both under "SIM Status" and "IMEI information". If present in bootloader, but not in settings, this may further point to a SIM card. Until you try (borrow) another carrier's SIM for 5 minutes you won't know for sure. At the very least you could get TMo to provision you new SIM. They should not charge you for this, and it may change your situation. There are many threads on this very same topic. Maybe searching those would give you another idea.

v12xke said:
The script uses fastboot erase which does not format the partitions. Formatting returns partition information, any errors and in some cases corrections. You did not mention IMEI within settings, both under "SIM Status" and "IMEI information". If present in bootloader, but not in settings, this may further point to a SIM card. Until you try (borrow) another carrier's SIM for 5 minutes you won't know for sure. At the very least you could get TMo to provision you new SIM. They should not charge you for this, and it may change your situation. There are many threads on this very same topic. Maybe searching those would give you another idea.
Click to expand...
Click to collapse
According to Google, the phone was purchased from them. They do not know if the phone is financed, as this would cause the IMEI to be locked. I'll try the T-Mobile store next.
Spent an hour at T-Mobile. The sales rep was determined to fix it, but in the end was unsuccessful. The Ebay seller issued an RMA and I dropped off at the P.O.. Will try getting another.

msmcintosh said:
According to Google, the phone was purchased from them. They do not know if the phone is financed, as this would cause the IMEI to be locked. I'll try the T-Mobile store next.
Click to expand...
Click to collapse
No, I meant the the Google-Fi the MVNO (carrier) not finance. If the phone was activated on Fi, it will have to be de-registered on their end. You still did not reply about IMEI present or not in Settings>>Sim info?

v12xke said:
No, I meant the the Google-Fi the MVNO (carrier) not finance. If the phone was activated on Fi, it will have to be de-registered on their end. You still did not reply about IMEI present or not in Settings>>Sim info?
Click to expand...
Click to collapse
When I went into Settings, the IMEI was present, but no carrier information. The phone recognized the SIM card, but that was all.
In the chat session with Google Support, I did ask about Google-Fi and she wrote that she was unable to provide any information on that. She said the only information she could provide is where the phone was purchased.

I came across the same issue. Just flash your vendor.img using flashfire, this will fix everything.

Another fix for the no sim is too turn off security pin lock and reboot the phone. I take no credit for this find just spreading the good word. ?

Exodusche said:
Another fix for the no sim is too turn off security pin lock and reboot the phone. I take no credit for this find just spreading the good word.
Click to expand...
Click to collapse
Thanks so much. Worked like a charm and could then reenable pin lock and reboot and SIM kept working.

swamp2 said:
Thanks so much. Worked like a charm and could then reenable pin lock and reboot and SIM kept working.
Click to expand...
Click to collapse
could you detail how to do just that? Because I'm in Brazil and I have the same problem.

Sim card not recognizing

Got a tough one. Ever since last Wednesday my SIM card hasn't been recognizing like it should be. It will randomly stop working and not work again untill I flash a new rom/backup/stock. I've tried clearing the cache... Nothing. When I go into *#*#4636#*#*, if I turn of radio power, it will recognize my phone number after about 10 seconds. Also, It says that APN settings are not available for this user under APN settings... Any help is appreciated, thanks.

Ol

olfred said:
jajajaja . You now . You have loose you imei the soluchion is root you divese an lukin the apk chamelephon.apk an thes apk repair you imei ok oleas dont flash a unoficial room . I am olfred velasco from mexixco
Click to expand...
Click to collapse
This only works with mediatek devices...

I have seen many posts about the sim card error, and have now experienced it myself. I have a USC XT1768 (on AT&T), running RR for about the last 4 months. Everything has worked perfectly until 3 nights ago when, suddenly, for no reason I had no service & saw there was "no sim" recognized. A Google search led me to switch to 3G and turn on airplane mode and reboot. After rebooting, I turned off airplane mode and service was restored. However, I am forced to use only 3G. After multiple "tests" switching back to 4G LTE, I always lose service. Yesterday, I "tested" again and LTE worked for about 8 hours before I got the sim card error. I re-did the airplane mode/3G process and I was back in business...just with 3G.
Last night when I got the "No Sim" error, I noticed that the preferred network in *#*#4636#*#* was "Unknown". It had been set to LTE/UMTS/Auto. It doesn't seem to make a difference if I switch it to Global, or anything else. The problem remains. Oddly, when I just entered *#*#4636#*#*, the preferred network setting was on WCDMA. Weird...I didn't select that setting.
Anyway, maybe this can kind of help someone else.

Tried the airplane mode/3g thing, still nothing for me. Just "lost" all recognition of a SIM. Nothing. No matter what I do, won't recognize. Lots online about it, loaded the latest F/W, etc., still nothing. The phone is like a new phone. Something feels hinkey about it though. Seems it's happening to unlocked Moto phones after about two-months.

TomJ2 said:
Tried the airplane mode/3g thing, still nothing for me. Just "lost" all recognition of a SIM. Nothing. No matter what I do, won't recognize. Lots online about it, loaded the latest F/W, etc., still nothing. The phone is like a new phone. Something feels hinkey about it though. Seems it's happening to unlocked Moto phones after about two-months.
Click to expand...
Click to collapse
I've had it for about a year when it happened, but what I did was send it to Moto and just told them it stopped working out of the blue. Flashed stock and sent it in. Within about 4 days they sent a new one. I would recommend that if you have a backup phone.

Did you have an unlocked bootloader (using the Moto code they send along with the warning that it'll void warranty)? If they still warrantied it, I'll do what you did, then sell the replacement ASAP. What an unreliable POS...

TomJ2 said:
What an unreliable POS...
Click to expand...
Click to collapse
Not really. Clearly a small percentage of E4s have a SIM problem; Moto should own up to it. However, that's unlikely as they never acknowledged the HW GPS issue on the G4P line that impacts a much larger proportion of devices.

codyalan said:
This only works with mediatek devices...
Click to expand...
Click to collapse
Just use QPST TOOL FROM QUALCOMM
https://www.androidbrick.com/ultima...agon-xiaomi-mi5-imei-and-baseband-repair-fix/
---------- Post added at 07:16 AM ---------- Previous post was at 07:14 AM ----------
I think it's more related to custom modifications

TomJ2 said:
Did you have an unlocked bootloader (using the Moto code they send along with the warning that it'll void warranty)? If they still warrantied it, I'll do what you did, then sell the replacement ASAP. What an unreliable POS...
Click to expand...
Click to collapse
Yeah, it was unlocked but I don't know why they had still look it though..

If you erase modemst1 and 2, the SIM will be recognized again. At least, it was on my XT1768. I wrote a small TWRP flashable version, for when it happens when I'm out and about. Just boot to recovery and "install" it. It's attached to my reply.
Additionally, the following firmware build is supposed to have the fix for this issue: https://androidfilehost.com/?fid=746010030569967659
Addendum: AFAIK, all Moto E4's running a build less than NPQ26.69-64 have the SIM issue. From what I've seen, it happens when one doesn't have any signal for a few hours, then comes back into an area that has a signal.

zahna said:
If you erase modemst1 and 2, the SIM will be recognized again. At least, it was on my XT1768. I wrote a small TWRP flashable version, for when it happens when I'm out and about. Just boot to recovery and "install" it. It's attached to my reply.
Additionally, the following firmware build is supposed to have the fix for this issue
Addendum: AFAIK, all Moto E4's running a build less than NPQ26.69-64 have the SIM issue. From what I've seen, it happens when one doesn't have any signal for a few hours, then comes back into an area that has a signal.
Click to expand...
Click to collapse
can you please explain this step by step for a naive person. My Moto E4 amazon version has same problem. Hoping to fix it on my own

satyavidu123 said:
can you please explain this step by step for a naive person. My Moto E4 amazon version has same problem. Hoping to fix it on my own
Click to expand...
Click to collapse
Can you boot TWRP or another custom recovery? Need that to apply the 'fix' in the form presented. Not even sure it will work on a bootloader locked device.
---------- Post added at 10:55 PM ---------- Previous post was at 10:53 PM ----------
zahna said:
Addendum: AFAIK, all Moto E4's running a build less than NPQ26.69-64 have the SIM issue. From what I've seen, it happens when one doesn't have any signal for a few hours, then comes back into an area that has a signal.
Click to expand...
Click to collapse
Must be other variables involved. Have a much older build and frequently travel to/through areas with no coverage. Have yet to experience a SIM issue.

satyavidu123 said:
can you please explain this step by step for a naive person. My Moto E4 amazon version has same problem. Hoping to fix it on my own
Click to expand...
Click to collapse
Your bootloader is locked, so you can't apply my fix from TWRP. You will need to hook up your phone to a computer, boot your phone to your bootloader (power + down), on your computer cd to your Android Sdk tools directory, then run "fastboot erase modemst1" and "fastboot erase modemst2", then reboot your phone.
However, you should be getting OTA updates. The most recent firmware should prevent the issue.

No Cell Service/Modem after flashing dump modem images H910. Advice requested.

Hello XDA,
I recently purchased a H910 from EBAY.
I was able to install Oreo and root it using the excellent tutorials before I was able to have a working sim card on hand so I cannot confirm if this phone was good or bad as I received it. I am using an activated ATT sim card and have used it in another phone with calls, texts, and data working. I have not for the life of me been able to get the any of these features to work on the H910. I have checked the APN settings, I have confirmed both the IMEI number and the sim ID number with ATT. The H910 is able to see the sim card but no mobile network is connected. I can use wifi calling and texting.
I did make a backup/dump of the phone and have flashed the modems, fsg, and misc images with no effect.
I have tried to restore to a stock image of 10q and 20G with the results ending in boot loops so I have not been able to test the stock firmware.
Is there any way to test for a hardware fault?
I would like to avoid returning this phone for something that could be fixed on my end.
Any advice would be greatly appreciated.

MDM3D said:
Hello XDA,
I recently purchased a H910 from EBAY.
I was able to install Oreo and root it using the excellent tutorials before I was able to have a working sim card on hand so I cannot confirm if this phone was good or bad as I received it. I am using an activated ATT sim card and have used it in another phone with calls, texts, and data working. I have not for the life of me been able to get the any of these features to work on the H910. I have checked the APN settings, I have confirmed both the IMEI number and the sim ID number with ATT. The H910 is able to see the sim card but no mobile network is connected. I can use wifi calling and texting.
Click to expand...
Click to collapse
What APN are you using ?
I did make a backup/dump of the phone and have flashed the modems, fsg, and misc images with no effect.
Click to expand...
Click to collapse
This sounds like a hardware failure
I have tried to restore to a stock image of 10q and 20G with the results ending in boot loops so I have not been able to test the stock firmware.
Click to expand...
Click to collapse
are you sure the roms are flashing correctly ? no errors in TWRP ?
I have restored many times with those 2 files and never had a bootloop, flash the 10q or 20G rom then format data before you reboot
Is there any way to test for a hardware fault?
I would like to avoid returning this phone for something that could be fixed on my end.
Any advice would be greatly appreciated.
Click to expand...
Click to collapse
Ive had nothing but great luck getting phones off ebay, but it really sounds like you may have gotten a lemon.
The H910v20 is one of the easiest phones to root and return to stock the 20G rom should work and immediately ask to update to 20H with a AT&T sim in it.
taking the 20G to 20H update will insure you have all the correct modem files and APN.

clsA said:
What APN are you using ?
This sounds like a hardware failure
are you sure the roms are flashing correctly ? no errors in TWRP ?
I have restored many times with those 2 files and never had a bootloop, flash the 10q or 20G rom then format data before you reboot
Ive had nothing but great luck getting phones off ebay, but it really sounds like you may have gotten a lemon.
The H910v20 is one of the easiest phones to root and return to stock the 20G rom should work and immediately ask to update to 20H with a AT&T sim in it.
taking the 20G to 20H update will insure you have all the correct modem files and APN.
Click to expand...
Click to collapse
clsA, Thank you for taking the time to reply, and for your excellent tutorials.
I tried both the stock(default) APN and manually entering the nxtgenphone APN info I was prompted by ATT but no change. Searches for a signal for about 30 seconds and the throws an x over the signal bars. The phone does detect the sim card and shows my phone number.
I do think it is hardware failure. All of the modem problems I have read have an error saying that the radio is off. I do not get this I get a message stating out of service. I also copied the Modem files from another stock H910 20H from a friend and that did not change anything. Their phone also shows signal bars even when the sim card is removed.
I checked the MD5 Hashes and they are correct on the SD card I was using. I saw no errors in TWRP and I tried 3 different flashing combos with both 10q and 20H. The first was to format device and then advance wipe system, cache, and dalvik, then flash, followed by format device. I then tried just format before and format after flashing, and then not formatting before and only formatting after and got the same boot loops with the 3 combos depending on whether I was using 10q or 20g. ie 2 different boot loops with the different zips. Once the boot loop started I could get to the stock recovery to "erase" the phone but that had no change. The only way I found to stop the loops was to flash the 996.kdz file using lgup and start over. The 20H file works perfectly. as does the 10R. It is really odd.