Develop Bugs

[Q] {PRO} Roaming, no 3G/H data after flashing any ROM

I have a MK16a and have happily unlocked the bootloader and flashed a new kernel over the stock ROM; I have the latest baseband installed.
Any time I try to flash another ROM, I can't get mobile data to work. I show as Roaming, and can connect to GSM but nothing else. APN settings are good. Flashing a different kernel doesn't seem to help either. I tried re-flashing the stock ROM and then a kernel and then the ROM I wanted, didn't work. I tried doing a Factory Reset over the stock ROM that works and flashing another ROM, didn't work. If I restore the backup I made before doing any of this, everything works again - I just can't get any other ROMs to work!
I've searched XDA and other sites pretty extensively and I'm not coming up with anything. Anyone got any ideas?

If you can, ask operator to change your SIM. Should be a few minutes process at the store. I had same issue a year ago as well, although I left the country already, so it was not a problem.
Just a note, that all questions should be posted in Q&A section.

Someguyfromhell said:
If you can, ask operator to change your SIM. Should be a few minutes process at the store. I had same issue a year ago as well, although I left the country already, so it was not a problem.
Interesting idea. I know the SIM works ok with the carrier-provided ROM on the phone, but it is a fairly old SIM card. Night be worth trying, tahnks for the suggestion!
Someguyfromhell said:
Just a note, that all questions should be posted in Q&A section.
Click to expand...
Click to collapse
*facepalm* Yes, of course they should.
Click to expand...
Click to collapse

Any luck yet?
If still same situation, make sure you are using baseband from MK16a firmware, not MK16i.

If your carrier is so-called virtual network operator, you may need to enable national data roaming in the settings. It's available in the mobile network settings at least in CyanogenMod ROMs.
--Ere

Someguyfromhell said:
If you can, ask operator to change your SIM.
Click to expand...
Click to collapse
Finally got around to doing this! Updating the SIM (which we figured out was probably between 5 to 8 years old) has resolved the issue.

[Q] 4G Lost After Flashing Firmware

Hi everybody,
I'm totally new in this flashing world and I was messing around with my new Xperia Z1 Compact trying to get Kit Kat installed because when I bought the phone it came with JB 4.3. I flashed Latest KitKat Nordic 14.3.A.0.757 unbranded, and everything worked like a charm until I discovered that I lost 4G connection (It only connects to 3G). I went to settings to select network, and LTE is checked.
I was reading about this matter and it seems that nordic ROM doesn't support LTE Band 7 (2600Mhz) which is the band in my carrier. I tried flashing Central Europe Rom and Global rom for journalists found here in the forums. None of them seems to support my LTE band. I want to know if there is any way to recover 4G changing any setting or if you know a link to any generic ROM compatible with LTE Band 7 (2600Mhz), or if there is any way to revert to my original Jellybean 4.3 ROM using PC Companion or Sony Update Service. Any help will be very apreciated.

Hello,
I am using the Generic UK .757 on a BAND4 LTE network in Canada.

you have checked off the first thing to do from the checklist..
second is to make sure your APN settings are correct.
All these are simple, but if still no luck, some labour is in order.
Need to do full wipe and clean re-install
IF you are not rooted, just launch Sony PC companion with the phone NOT CONNECTED and do a repair. It should by default take you to KK
At the time of flashing, You probably had the wrong boxes checked and unchecked in the WIPE and Exclude boxes..

I'll try the two options
Thanks guys for the responses.
First I'll try to flask UK ROM to see if finally I get kitkat working on my phone. If this doesn't work I'll take the second option with PC Companion to restore the original ROM. I'll post the results.

It seems this rom doesn't work for me
GuizmoPhil said:
Hello,
I am using the Generic UK .757 on a BAND4 LTE network in Canada.
Click to expand...
Click to collapse
Hi Phil,
I found UK rom in this forum ver. .681 and flashed it, then I downloaded OTA update to .757. So far the problem remains. I discovered that I was wrong about My LTE Band, is 7 not 4. Apparently there's a carrier in UK with band [email protected] same as here (Colombia), so theorically this rom should work, but this is not the case. I'm trying to change more settings without luck. If you know something to help me, it would be very appreciated. Thanks.

Y2j-Hotaru said:
Hi Phil,
I found UK rom in this forum ver. .681 and flashed it, then I downloaded OTA update to .757. So far the problem remains. I discovered that I was wrong about My LTE Band, is 7 not 4. Apparently there's a carrier in UK with band [email protected] same as here (Colombia), so theorically this rom should work, but this is not the case. I'm trying to change more settings without luck. If you know something to help me, it would be very appreciated. Thanks.
Click to expand...
Click to collapse
Try changing it from the ussd *#*#4636#*#*
Sent from my C6902 using XDA Free mobile app

not able to download original rom
jewelkobayashi said:
you have checked off the first thing to do from the checklist..
second is to make sure your APN settings are correct.
All these are simple, but if still no luck, some labour is in order.
Need to do full wipe and clean re-install
IF you are not rooted, just launch Sony PC companion with the phone NOT CONNECTED and do a repair. It should by default take you to KK
At the time of flashing, You probably had the wrong boxes checked and unchecked in the WIPE and Exclude boxes..
Click to expand...
Click to collapse
Hi jewelkobayashi,
I tried the method you wrote, but, despite the phone being disconnected, it downloaded the same ROM that I recently have flashed (GLOBAL .757 commercial and Journalist). Is there any other way to download the original Phone ROM . I know my original ROM is GLOBAL-14.2.A.1.114 and the customization number is 1281-3723. I haven't found any site to download this exact firmware. If you know something, it would be very appreciated. Thanks in advance.

Are you sure about your customization number? Because it gets changed if you flash another firmware. Here's everything you need to know: http://forum.xda-developers.com/showthread.php?p=52011642 to download your firmware. By the way, what's your country, branding and SI-Number (so I can add your customization number to the list)?

Y2j-Hotaru said:
Hi everybody,
I'm totally new in this flashing world and I was messing around with my new Xperia Z1 Compact trying to get Kit Kat installed because when I bought the phone it came with JB 4.3. I flashed Latest KitKat Nordic 14.3.A.0.757 unbranded, and everything worked like a charm until I discovered that I lost 4G connection (It only connects to 3G). I went to settings to select network, and LTE is checked.
I was reading about this matter and it seems that nordic ROM doesn't support LTE Band 7 (2600Mhz) which is the band in my carrier. I tried flashing Central Europe Rom and Global rom for journalists found here in the forums. None of them seems to support my LTE band. I want to know if there is any way to recover 4G changing any setting or if you know a link to any generic ROM compatible with LTE Band 7 (2600Mhz), or if there is any way to revert to my original Jellybean 4.3 ROM using PC Companion or Sony Update Service. Any help will be very apreciated.
Click to expand...
Click to collapse
Stop flashing random ROMs and check your settings! Unless you have a different model phone than the rest of us (there are three, D5503, M51w and SO-02F), then ANY Z1C (D5503) ROM will work, but they come with different APN lists as bundling every carrier in the worlds APN settings would be a waste of space. Go to Settings > Mobile Networks > Access Point Names, and edit or create the correct APN in there. Look at a friends phone or on your carriers website for the correct settings. This is your problem, no doubt about it.
Please note that some carriers (mine included) have a special APN for LTE. E.g. standard is internet.tele2.se, LTE is 4g.tele2.se on my carrier.
...I have no idea where you're getting your data from, because literally every LTE network in the Nordics uses band 7.

Finally it worked
Rekoil said:
Stop flashing random ROMs and check your settings! Unless you have a different model phone than the rest of us (there are three, D5503, M51w and SO-02F), then ANY Z1C (D5503) ROM will work, but they come with different APN lists as bundling every carrier in the worlds APN settings would be a waste of space. Go to Settings > Mobile Networks > Access Point Names, and edit or create the correct APN in there. Look at a friends phone or on your carriers website for the correct settings. This is your problem, no doubt about it.
Please note that some carriers (mine included) have a special APN for LTE. E.g. standard is internet.tele2.se, LTE is 4g.tele2.se on my carrier.
...I have no idea where you're getting your data from, because literally every LTE network in the Nordics uses band 7.
Click to expand...
Click to collapse
Thanks for your response. I verified APN settings with friend's phones and it was identical. Finally I called my carrier's help desk and after some try/error setups with them, they gave me an alternate APN that worked until I came home where 4G icon dissapeared again. Then, I was surprised with helpdesk response when I called them again. "There is no 4G coverage in your home area". O.O What is intriging to me is that the phone displayed 4G all the time when I just bought it (Even with restarts and wherever i was) and this changed only when I flashed a generic rom. Is just a silly assumption, but, is possible that carriers can make things like force 4G icon in their custom roms to make advertising or something like that? Just asking. Anyway, Thanks a lot for the responses.

crohit911 said:
Try changing it from the ussd *#*#4636#*#*
Sent from my C6902 using XDA Free mobile app
Click to expand...
Click to collapse
Emmm do you have a manual to how to use the ussd??
I went into it to check it out, I touched I don't know what...
And now I can no longer connect to my network provider...
(reboot doens't helps, changing to wdmca or gsm or other options doesn't changes, VPN seems ok, I have no signal... )
Help!!!

Ok, this is what I did to screw it all
Go to the ussd *#*#4643#*#*
Go to phone info
Go to setings and Select radio band
It gives me the option of GSM/UMTS band = USA Band
-> I no longer have WCDMA or GSM connection :S
(LTE still works...)
Now, how do I go back to my previous options? or does it has nothing to do with it, and the problem is something else?
EDIT> problem solved, I had to reflash my ftf by just updating the FOTA (not sure I needed this...) and the BASEBAND... Now I am back up and running again.. >D

emilic said:
Ok, this is what I did to screw it all
Go to the ussd *#*#4643#*#*
Go to phone info
Go to setings and Select radio band
It gives me the option of GSM/UMTS band = USA Band
-> I no longer have WCDMA or GSM connection :S
(LTE still works...)
Now, how do I go back to my previous options? or does it has nothing to do with it, and the problem is something else?
EDIT> problem solved, I had to reflash my ftf by just updating the FOTA (not sure I needed this...) and the BASEBAND... Now I am back up and running again.. >D
Click to expand...
Click to collapse
Good to know that your problem is solved, even better you solved it yourself. Sorry for not being able to help, I don't know about that ussd code I shall try.
Sent from my C6902 using XDA Free mobile app

crohit911 said:
Good to know that your problem is solved, even better you solved it yourself. Sorry for not being able to help, I don't know about that ussd code I shall try.
Sent from my C6902 using XDA Free mobile app
Click to expand...
Click to collapse
Actually, there's an app in Google Play that is a shortcut to this ussd code : 4G LTE SWITCH

[Q] E986 Greek

I own an E986 for one month, I bought it from Greece but it must be from Germany. My problem is that after rooting and installing many custom roms and stock roms I dont have 4g signal. I have tried everything, hidden menus, 4g switchers, flashing modems from allover the world just in case something works, flashing back to stock with lg flash tool, I tried stock 4.1.2 and 4.4.2, I erased APN's and added again......and many many more. Can anybody please help me? I will try any ideas, one last thing, the signal of the mobile carrier is depending only on the modem I install or are there any other parameters that I should try to flash. Thanks in advance!!!!

tzamakos said:
I own an E986 for one month, I bought it from Greece but it must be from Germany. My problem is that after rooting and installing many custom roms and stock roms I dont have 4g signal. I have tried everything, hidden menus, 4g switchers, flashing modems from allover the world just in case something works, flashing back to stock with lg flash tool, I tried stock 4.1.2 and 4.4.2, I erased APN's and added again......and many many more. Can anybody please help me? I will try any ideas, one last thing, the signal of the mobile carrier is depending only on the modem I install or are there any other parameters that I should try to flash. Thanks in advance!!!!
Click to expand...
Click to collapse
If you've flashed back to a stock TOT/KDZ and still have no 4G, then it seems like it cannot be any software setting other than APN configuration, and if you're certain that's right, then it could be worth it to try a different SIM card.
What else could it be? If you've flashed a correct stock image for your model, then you've ruled out software issues other than configuration, and if it once worked with the same software configuration (APN settings, etc.) then what else could it be but hardware, something tangible?

culot said:
If you've flashed back to a stock TOT/KDZ and still have no 4G, then it seems like it cannot be any software setting other than APN configuration, and if you're certain that's right, then it could be worth it to try a different SIM card.
What else could it be? If you've flashed a correct stock image for your model, then you've ruled out software issues other than configuration, and if it once worked with the same software configuration (APN settings, etc.) then what else could it be but hardware, something tangible?
Click to expand...
Click to collapse
So what do you believe? Do you think that I have a hardware issue? But how on earth is it possible to have 3g and H signal but no 4g. I have flashed every stock rom for my device through kdz method but I haven't tried the tot method, do you believe that this might be the solution? I have even bought another sim card from my provider but no luck, should I try another provider? Phewwww I ask a lot I know please forgive me it' s that I have never faced a problem before that I couldn't overcome......

tzamakos said:
So what do you believe? Do you think that I have a hardware issue? But how on earth is it possible to have 3g and H signal but no 4g. I have flashed every stock rom for my device through kdz method but I haven't tried the tot method, do you believe that this might be the solution? I have even bought another sim card from my provider but no luck, should I try another provider? Phewwww I ask a lot I know please forgive me it' s that I have never faced a problem before that I couldn't overcome......
Click to expand...
Click to collapse
KDZ is sufficient. I don't see how TOT would make any difference. Maybe you could try just to familiarize yourself with the method. I don't see how that could make any difference, but maybe I'm more ignorant that I realize (this happens often enough).
So you've had 4G on that phone with that same provider before? WIth the same plan? If it's not software, and not hardware, then maybe it's to do with the carrier? I think you can be pretty safe that it's not software if you've got a stock image flashed on there, and if your APN settings are spot-on. That would leave:
- SIM card
- Phone hardware
- Carrier
- ?what else?
If it's not software, as in if you've got a fresh stock image flashed, then what else could it be but hardware? Maybe I'm missing something.. dunno.
Have you tried the SIM cards in any other phone to see if 4G works?

culot said:
KDZ is sufficient. I don't see how TOT would make any difference. Maybe you could try just to familiarize yourself with the method. I don't see how that could make any difference, but maybe I'm more ignorant that I realize (this happens often enough).
So you've had 4G on that phone with that same provider before? WIth the same plan? If it's not software, and not hardware, then maybe it's to do with the carrier? I think you can be pretty safe that it's not software if you've got a stock image flashed on there, and if your APN settings are spot-on. That would leave:
- SIM card
- Phone hardware
- Carrier
- ?what else?
If it's not software, as in if you've got a fresh stock image flashed, then what else could it be but hardware? Maybe I'm missing something.. dunno.
Have you tried the SIM cards in any other phone to see if 4G works?
Click to expand...
Click to collapse
To tell you the truth I haven't tried the sim to another phone because I don't have another 4g phone, I have contacted my carrier and they confirmed that I have 4g signal. Who knows, I cant understand how it could be a hardware issue since I have 3g and H signal, do you know if apart from modem is there anything else that I could flash in order to have better signal reception? For example flashing kernel or something else....

tzamakos said:
To tell you the truth I haven't tried the sim to another phone because I don't have another 4g phone, I have contacted my carrier and they confirmed that I have 4g signal. Who knows, I cant understand how it could be a hardware issue since I have 3g and H signal, do you know if apart from modem is there anything else that I could flash in order to have better signal reception? For example flashing kernel or something else....
Click to expand...
Click to collapse
Maybe visit some cell phone shop and ask if you can ram your SIM into one of their phones for a minute, to test.
If you've flashed a KDZ, I don't see what else you could do, software-wise, on top of that. Have you ventured very far into the hidden diagnostic menus? I know there's tests in there for most everything, ones that show if you've got a 4G connection and exactly what detailed connection info is available.
EDIT: Oh, you can look into your service manual here. Maybe you could pull a MacGyver, yes?

culot said:
Maybe visit some cell phone shop and ask if you can ram your SIM into one of their phones for a minute, to test.
If you've flashed a KDZ, I don't see what else you could do, software-wise, on top of that. Have you ventured very far into the hidden diagnostic menus? I know there's tests in there for most everything, ones that show if you've got a 4G connection and exactly what detailed connection info is available.
EDIT: Oh, you can look into your service manual here. Maybe you could pull a MacGyver, yes?
Click to expand...
Click to collapse
I followed your advice, I tried my sim to another 4g phone and it works perfectly, I even bought a sim card from another provider just in case but again no luck, 4g signal wont show on. The hidden menu is something that I have discovered but dont know what values to change, I just checked that lte is enabled. My only hope is to find the original stock rom for Greece named e98610c.kdz I believe to flash it and see if it works, but I cant find it anywhere. My phone is from Germany though, another option I have is to find a second stock rom from Germany different than the e98610i.kdz, I have seen an e98610a.kdz, but I wasnt able to find and download it. Any help would be very nice, but thanks anyway.

culot said:
Maybe visit some cell phone shop and ask if you can ram your SIM into one of their phones for a minute, to test.
If you've flashed a KDZ, I don't see what else you could do, software-wise, on top of that. Have you ventured very far into the hidden diagnostic menus? I know there's tests in there for most everything, ones that show if you've got a 4G connection and exactly what detailed connection info is available.
EDIT: Oh, you can look into your service manual here. Maybe you could pull a MacGyver, yes?
Click to expand...
Click to collapse
Hallo again, one more question, is it possible that I have flashed a modem that is capable of 4g but in bandwith that my provider in Greece doen't support?

tzamakos said:
Hallo again, one more question, is it possible that I have flashed a modem that is capable of 4g but in bandwith that my provider in Greece doen't support?
Click to expand...
Click to collapse
I don't think so. If you've flashed back to stock with a KDZ/TOT, then you're golden.
Who is your Grecian provider? What are your current APN settings?

culot said:
I don't think so. If you've flashed back to stock with a KDZ/TOT, then you're golden.
Who is your Grecian provider? What are your current APN settings?
Click to expand...
Click to collapse
My Greek provider is named Cosmote and my APN settings are the following
Name Cosmote Internet
APN internet
MCC 202
MNC 01
APN type default
Hope this tells you something, looking forward to replying me :

tzamakos said:
My Greek provider is named Cosmote and my APN settings are the following
Name Cosmote Internet
APN internet
MCC 202
MNC 01
APN type default
Hope this tells you something, looking forward to replying me :
Click to expand...
Click to collapse
Did you find your e986 Greek stock image yet? Just curious. I swear it sounds like a hardware problem though. Dunno.

culot said:
Did you find your e986 Greek stock image yet? Just curious. I swear it sounds like a hardware problem though. Dunno.
Click to expand...
Click to collapse
No unfortunately I couldn't find anything, I now flash some 4.4.2 rom from e988 just in case.....

Will not register to network

hello ladies and gents I bought a note 3 yesterday from some dude thinking I could fix it and get a note 3 on the cheap. I was wrong the problem is hard to fix.
1 It will not register to network
it is not blacklisted or network blocked.
Ive read somewhere that after you register to many different sims it wont allow it to connect to network anymore.
what can I do I wonder as a last ditch effort if I replace the motherboard if that will work any suggestions please?

darkphate83 said:
hello ladies and gents I bought a note 3 yesterday from some dude thinking I could fix it and get a note 3 on the cheap. I was wrong the problem is hard to fix.
1 It will not register to network
it is not blacklisted or network blocked.
Ive read somewhere that after you register to many different sims it wont allow it to connect to network anymore.
what can I do I wonder as a last ditch effort if I replace the motherboard if that will work any suggestions please?
Click to expand...
Click to collapse
Have you tried updating the firmware? check the APN on the phone once you insert the sim.

You could try taking it to a T-Mobile store to see if they can get it to register. Sometimes they can activate it when you can't.

JSing said:
Have you tried updating the firmware? check the APN on the phone once you insert the sim.
Click to expand...
Click to collapse
bobbyphoenix said:
You could try taking it to a T-Mobile store to see if they can get it to register. Sometimes they can activate it when you can't.
Click to expand...
Click to collapse
I cant take it to the store i bought it from someone or at least i dont think i can it didnt have the knox counter activiated but now it does so im pretty sure the thing that resends and receives the signal is broken but im not sure where it is.
its basically a tablet :/

darkphate83 said:
I cant take it to the store i bought it from someone or at least i dont think i can it didnt have the knox counter activiated but now it does so im pretty sure the thing that resends and receives the signal is broken but im not sure where it is.
its basically a tablet :/
Click to expand...
Click to collapse
Try updating to the latest firmware. Something might have broke the modem during an upgrade. Go to www.sammobile.com

JSing said:
Try updating to the latest firmware. Something might have broke the modem during an upgrade. Go to www.sammobile.com
Click to expand...
Click to collapse
everything else works without flaw it seems just will not register on network when I try the mobile data turns off and then it just never does.
Ive flashed 2 different modems via odin tried using a att sim (still no registering)
The phone is unlocked. I dont know what to do.

Imei blocked.

trim81 said:
Imei blocked.
Click to expand...
Click to collapse
It is most definitely not imei blocked.
It feels like it might be hardware related but I have no idea how to fix that. some piece that deals only with registering on networks.

Corrupted efs folder is my other guess

trim81 said:
Corrupted efs folder is my other guess
Click to expand...
Click to collapse
can that be fixed? Ive flashed different versions of 4.4.2 and nothing seems to help changed basebands

trim81 said:
Corrupted efs folder is my other guess
Click to expand...
Click to collapse
okay I used my working note 3 to copy the efs with samsung tools then uploaded to drive installed samsung tools on the new note 3 and restored the efs from he working phone nothing changed any other ideas?
Notes:
I have 2, note 3s
1 working
1 not working

Sounds like a network block. Post a screenshot of the failing to register device after dialing *#0011#
Sent from my leanKernel 3.16 powered stock 4.4.2 SM-N900T

Here you go and thank you for helping.

Here is the working note 3 also this one is also tmobile variant but on att

Go to www.swappa.com/esn
Check the imei number.
What does it say?

Clean like I said it seems hardware related I can't figure it out.

darkphate83 said:
Here you go and thank you for helping.
Click to expand...
Click to collapse
Well, that's interesting.
If you go to settings, mobile networks, and search for networks, can you select the network and have it register?
Also double check the apn settings. I borked my hidden apn settings once and couldn't get back on the network until i wiped and reflashed full stock.
If none of that works, try also resetting the nv. Look for my thread on 900t service mode for instructions.
Sent from my leanKernel 3.16 powered stock 4.4.2 SM-N900T

I've already rebuilt the nv build. It's a family mobile sim(tmobile)
Also the apn settings I can try that again haven't changed them since I did a flashed back to stock. I doubt it will change anything usually you can still register.
oh the sim doesn't even have service anymore anyhow. Yesterday was the last day but I don't think that would change being able to register anyway.

Notice that it turns off mobile data when I try to register it may be a clue but I haven't been able to make anything of it.
http://forum.xda-developers.com/showthread.php?t=2754957
toastido I ran into your thread yesterday and did that but ill rebuild again maybe ill get lucky?

darkphate83 said:
can that be fixed? Ive flashed different versions of 4.4.2 and nothing seems to help changed basebands
Click to expand...
Click to collapse
Edited
See rebuilt again. Changed apn settings nothing.

Anyone got Orange internet working on LG G4 with custom rom?

I've been using quite a few custom roms and with none Mobile Network had worked. I've been to Orange office to try my SIM card on another phone to see if it's my phone's fault or SIM card doesn't let me to connect to the internet and it turned out that everything worked on another phone.
I am probably running 20B stock firmware with CrDroid rom on the top of that.
I read that newest 20E stock firmware fixed some problems for Europe Orange users so I thought that flashing this update may fix this issue. Will the internet work on custom roms as well or will I have to stay on stock to have it working?

Anyone has any knowledge on that topic? /bump/

Sztermel said:
Anyone has any knowledge on that topic? /bump/
Click to expand...
Click to collapse
Did you change the APN access point settings under mobile data? They know nothing about it in the Orange store. I had to check online for the settings.

jobella said:
Did you change the APN access point settings under mobile data? They know nothing about it in the Orange store. I had to check online for the settings.
Click to expand...
Click to collapse
Sure, I tried changing it many times. It definitely is not an issue, it's more like something related to phone's firmware I think that phone doesn't want to connect to mobile data.
I'm downloading stock 20e firmware and I'll see how it's going to work after install.