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.

Can't Select Network Operator - HELP

I had my phone working fine on 2.3.6, but I have recently flashed my ROM.
I followed these EXACT instructions (http://www.lorenzobettini.it/2013/08/update-samsung-galaxy-wonder-i8150-to-android-jelly-bean/) and afterwards, I couldn't see Virgin Mobile UK as a Network Operator to connect to. So I can only use WiFi. (However, I saw T-Mobile, Orange, Vodafone and Three. It automatically connected me to T-Mobile, but nothing worked)
I thought it may be a problem with the ROM, so I used the Stable release of this: http://forum.xda-developers.com/showthread.php?t=2120340 ... I have the same problem.
I've now tried a third: http://forum.xda-developers.com/showthread.php?t=2401757 ... still doesn't work.
It can't be the ROMs... Could I need to upgrade my baseband? I don't really know what a baseband is, just what hours of Googling has brought up.
How can I fix this?

WazzleHD said:
I had my phone working fine on 2.3.6, but I have recently flashed my ROM.
I followed these EXACT instructions (http://www.lorenzobettini.it/2013/08/update-samsung-galaxy-wonder-i8150-to-android-jelly-bean/) and afterwards, I couldn't see Virgin Mobile UK as a Network Operator to connect to. So I can only use WiFi. (However, I saw T-Mobile, Orange, Vodafone and Three. It automatically connected me to T-Mobile, but nothing worked)
I thought it may be a problem with the ROM, so I used the Stable release of this: http://forum.xda-developers.com/showthread.php?t=2120340 ... I have the same problem.
I've now tried a third: http://forum.xda-developers.com/showthread.php?t=2401757 ... still doesn't work.
It can't be the ROMs... Could I need to upgrade my baseband? I don't really know what a baseband is, just what hours of Googling has brought up.
How can I fix this?
Click to expand...
Click to collapse
try changing ur baseband/ modem with the one intended for ur country/ region.

dec0der said:
try changing ur baseband/ modem with the one intended for ur country/ region.
Click to expand...
Click to collapse
okay, if this goes wrong, can i restore from my backup on CWM and it'll be fine? also, where ís a tutorial for this?

no need to change operator
Virgin media pay T-mobile/EE to use their network all you got to do i change the apn on your phone manually to get your data and you will be fine
i know this becase i have been doing for the last few months and had no problems

spawnofdonny said:
Virgin media pay T-mobile/EE to use their network all you got to do i change the apn on your phone manually to get your data and you will be fine
i know this becase i have been doing for the last few months and had no problems
Click to expand...
Click to collapse
Okay, will flash a new ROM and will try now.
EDIT: It didn't work for me...
EDIT2: Got it working, used a different APN... Thank you SO much, you're a life saver!

[Q] LTE Activation in LG-D855

I am trying to activate the LTE network but fail to find this option.
My phone is LG-D855. FW - V10e-EUR-XX
I am looking under: Networks -> Tethering & Networks -> Mobile networks -> Network mode
I see GSM/WCDMA auto. I don't see an LTE option.
The LTE is activated in the service provider registration of my device.
How do I activate the LTE option?
Thank you
Tuviya

tuviya said:
I am trying to activate the LTE network but fail to find this option.
My phone is LG-D855. FW - V10e-EUR-XX
I am looking under: Networks -> Tethering & Networks -> Mobile networks -> Network mode
I see GSM/WCDMA auto. I don't see an LTE option.
The LTE is activated in the service provider registration of my device.
How do I activate the LTE option?
Thank you
Tuviya
Click to expand...
Click to collapse
another member has your same problem....
i am running the same firmware as you and i have 4g option....
Maybe you should try to reset the phone...
Sent from from my LG-D855

EpicChineseTime said:
another member has your same problem....
i am running the same firmware as you and i have 4g option....
Maybe you should try to reset the phone...
Sent from from my LG-D855
Click to expand...
Click to collapse
Thank you for the fast answer.
I have done a reset several times but I don't see the LTE option.
Can you specify where can I find it?
I suspect that the firmware version I have hides the LTE. but I am not sure.
I will appreciate it if somebody can direct me on how to activate the LTE

tuviya said:
Thank you for the fast answer.
I have done a reset several times but I don't see the LTE option.
Can you specify where can I find it?
I suspect that the firmware version I have hides the LTE. but I am not sure.
I will appreciate it if somebody can direct me on how to activate the LTE
Click to expand...
Click to collapse
I also have this problem; the LTE option does not show. Another thread mentioned enabling via a service menu but I was unable to access that with 5457#*400#
Seem mad to have this option hidden.

wellsi said:
I also have this problem; the LTE option does not show. Another thread mentioned enabling via a service menu but I was unable to access that with 5457#*400#
Seem mad to have this option hidden.
Click to expand...
Click to collapse
is your phone locked to a carrier? or is it unlocked?

koppee1 said:
is your phone locked to a carrier? or is it unlocked?
Click to expand...
Click to collapse
No; it's an unlocked international model.
On another site I have found that *#*#4636#*#* brings up the service menu and allows me to change the radio bands to include LTE.
The moment I do that, I connect to 4G immeidately; however it won't stay if I reboot the phone or view the standard network mode settings, when it jumps back to 3g.
Cheers
Ian

I have downloaded and installed "4G Switcher" from Google Play
and activated LTE (preferred network type - LTE/GSM/WCDMA). it solved the 4G issue. its not the straight forward solution but it works

You can enable it in the hidden menu
On the 855 dial 3845#*855# then choose :
LTE Only>Modem Settings>RAT Selection
Choose : GSM / WCDMA / LTE Auto
As soon as I selected this my 4G kicked in to life.
Hope it works - enjoy
Nick

works but...
NickBeswick said:
You can enable it in the hidden menu
On the 855 dial 3845#*855# then choose :
LTE Only>Modem Settings>RAT Selection
Choose : GSM / WCDMA / LTE Auto
As soon as I selected this my 4G kicked in to life.
Hope it works - enjoy
Nick
Click to expand...
Click to collapse
I try this and works :laugh:, i have the D855 international from taiwan with v10i-TWN-XX, but... the thing is that every time that reboot or the battery is gone the configuration lost, is possible made this change permanently and that appear the access into preferences network too?

conex79 said:
I try this and works :laugh:, i have the D855 international from taiwan with v10i-TWN-XX, but... the thing is that every time that reboot or the battery is gone the configuration lost, is possible made this change permanently and that appear the access into preferences network too?
Click to expand...
Click to collapse
I've not been able to make it permanent, but I did download a great free little app called "4G Switcher" that you click to directly to open up the developer menu without having to key in the code. It makes swtiching it back to LTE a 2 second job......

lteconfigs
wellsi said:
I've not been able to make it permanent, but I did download a great free little app called "4G Switcher" that you click to directly to open up the developer menu without having to key in the code. It makes swtiching it back to LTE a 2 second job......
Click to expand...
Click to collapse
If you see design 4g option but it always go back on 3g just uninstall the app Lteconfigs and for those who don't have the 4g option look if in you app is the Lteconfigs, if not, just installed ...

fix lte option with build.prop editor
There is a permanent fix but have be rooted. But seeing as rooting and unrooting so simple, that shouldn't be a problem.
Simply use a Prop Build editor to go into the build.prop and change the "telephony.lteOnCdmaDevice” value from 0 to 1. There are two lines on in the G3 build prop. Make sure both have the value of 1. Then save. Then reboot.
I applied this to my G3 problem and now it is completely fixed!! I can select LTE auto and it stays, even on a reboot! I'll basically have to do this everytime i flash a new rom or update but it works!
I'll probably make a YouTube video later today to share the fix.

This is utter bullsh1t from LG. I've just bought a 32Gb model which came with V10X-Euro -XX software on it and I can't select LTE/4G to use on my network. What a flapping joke. I do not wish to root my phone or use an app from the store simply to enable 4G in my phone.
Jeebus! I'm NOT happy ffs
Can't they fix this terrible mistake? It's been months since the device came out
Grr

@homerlovesbeer: Without root, on the D855, you can enable LTE. Follow my guide here: Detailed Guide.
However, if you reboot, or switch to 2G, you will lose LTE and must repeat the process. For those who want to make it permanent, I have found a way to make LTE stay, but it requires root (More explained in the guide).

Yep thanks. I can enable using the service menu however my issue is with LG MAKING me use this method, which is NOT permanent, to enable something which should be accessed through normal means like most G3 devices.
I mean what the hell?

Tried this on my D855 on AT&T but I get an error after dialing.. Won't let me into hidden menu

I foolishly installed V20F-TWN-XX Lolipop 5.0 over my 4.4.2 V10e-EUR-XX on my LG G3 855. I've now lost LTE unless I go through the menu 3845#*855#.
Can anyone recommend a KDZ that will fix this issue, or do I need to go back to 4.4.2 to root my phone installing that backup program and go that direction.. Any help would be appreciated.

homerlovesbeer said:
Yep thanks. I can enable using the service menu however my issue is with LG MAKING me use this method, which is NOT permanent, to enable something which should be accessed through normal means like most G3 devices.
I mean what the hell?
Click to expand...
Click to collapse
If you don't have LTE in RAT selection menu, then either LG still hadn't updated LTEconfigs with your service provider, or your phone's region doesn't match your location.
If you bought the phone intended for different region - well, you are the only one to blame. If not - ask LG support to add your carrier to lteconfigs in next update.
kdp162 said:
Tried this on my D855 on AT&T but I get an error after dialing.. Won't let me into hidden menu
Click to expand...
Click to collapse
Which error occured?
Spazdarn said:
I foolishly installed V20F-TWN-XX Lolipop 5.0 over my 4.4.2 V10e-EUR-XX on my LG G3 855. I've now lost LTE unless I go through the menu 3845#*855#.
Can anyone recommend a KDZ that will fix this issue, or do I need to go back to 4.4.2 to root my phone installing that backup program and go that direction.. Any help would be appreciated.
Click to expand...
Click to collapse
Which region your phone is currently using? Go into "setting->about the phone->software" menu, look at "firmware version". Is it 20F-TWN-XX? If so, check this link (replacing X'es for IMEI):
Code:
http://csmg.lgmobile.com:9002/csmg/b2c/client/auth_model_check2.jsp?esn=XXXXXXXXXXXXXXX
If your suffix looks like this:
Code:
<suffix>ATWNTN</suffix>
, then your phone actually originated from Taiwan, and flashing any KDZ higher than 10h won't help. You need to change region via guide in General, or to delete LTEconfigs. Both require root, so you'll have to downgrade to 4.4.2, root it, etc etc etc...

Spazdarn said:
I foolishly installed V20F-TWN-XX Lolipop 5.0 over my 4.4.2 V10e-EUR-XX on my LG G3 855. I've now lost LTE unless I go through the menu 3845#*855#.
Can anyone recommend a KDZ that will fix this issue, or do I need to go back to 4.4.2 to root my phone installing that backup program and go that direction.. Any help would be appreciated.
Click to expand...
Click to collapse
Funny, but upgrading to Lillipop actually fixed mine so I now have LTE available as an option in the mobile network settings where before the update I had to force LTE in the service menu. Same 4.4.2 V10e-EUR-XX as yours previously.

homerlovesbeer said:
Funny, but upgrading to Lillipop actually fixed mine so I now have LTE available as an option in the mobile network settings where before the update I had to force LTE in the service menu. Same 4.4.2 V10e-EUR-XX as yours previously.
Click to expand...
Click to collapse
I had to go back to 4.4.2, root it, install twrp, install lollipop through that while also installed SU.
All this just to keep my root, to allow me to edit my build.prop file while allowed me to reintroduce my LTE functionality.
Quite a lot of messing about! Next time I won't be so eager to change!

[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.....

Request advice from the experts on troubleshooting or install stock rom

Hi all,
Would like to thank you in advance in taking your time in reading this post. Its my first time (and post) with the XDA forums. I have a few questions I am not sure if Im doing the correct thing so Im hoping for advice for the experts here in the forum to point me in the right direction.
Technical skills - never flashed a phone before but reading the step by step instructions available in the forums.
A few information with my phone to help with troubleshooting
- Purchased with no warranty overseas because they dont sell it here in the Philippines
- Phone came with the following specs
- Android 8 with Nov 1, 2018 patch
- unlock bootloader
- software channel - retcn
- Build number - OPXS27.109-52-10
- Baseband version - M8988_20207.117.02.41-01.01R NCD
Issue:
1. 4G Network - not working at all on the local network. It seems to be able to go to 4G but cannot make outgoing or incoming phone calls/ text or mobile data.
- troubleshooted by resetting phone, changing apn with no luck. Changing it to 3G only seems to make the phone work to make voicecalls/text and mobile connection
2. Random apps crashing - namely - grab (like uber) and spotify.
- tried resetting the phone (and installed just grab app only after reset but still not working) and cleared partition cache boot mode but still no change.
Proposed solution
- installing a new stock rom - should fix the apps crashing issue and 4g issue
- installing custom rom like lineage (discarded this solution because it will disable audio mods) - i bought the moto mods JBL accessory.
questions:
1. Based on this thread - (https://forum.xda-developers.com/z2-force/how-to/how-to-return-to-stock-sprint-t3694783)
- I wish to install stock rom but Im not sure which rom to use. Do I use USC version based on the phones current build number? - OPXS27.109-52-10 or can I change to a different US carrier like verizon ?(related to next question)
2. Is there anyway to change/fix the carrier frequency so it will start accepting 4g locally here?
- will installing a stock rom with a different carrier (i.e. verizon), will that change baseband and accept other frequencies or will I brick my phone?
- Or hope the stock rom with a different patch will fix it? Ive read in forums it could just be the newer patches that giving me issues. The one available for USC is version OPXS27.109-40-7. Upon checking my local carrier and USC band frequencies, both have 5 band with 850ghz frequency available. So Im beginning to think it could be a software rather than carrier issue
3. Because the phone came with a unlocked bootloader, does that mean I will never receive OTA updates from the stock rom? I will have to manually update it when android 9 comes out?
4. software channel - retcn - does that have to do with anything with baseband or installing stock rom? Does this help in any trouble shooting? Ive seen a few threads in the forums with builds with specific software channel in other threads with specific models xt1789 - 02 or 03 or 06. I dont know if that affects stock roms?
-----------------------------------
Maybe it would also help to show my local 4g frequencies and band number
Smart Band is here below
Frequency Protocol Class Band Number
700MHz FDD-LTE/LTE-A 4G 28
850MHz FDD-LTE/LTE-A 4G 5
1800MHz FDD-LTE/LTE-A 4G 3
2100MHz FDD-LTE/LTE-A 4G 1
2300MHz TDD-LTE 4G 40
Sorry for some newb questions and I welcome any other methods of troubleshooting or suggestions you guys can give me. I feel installing stock rom USC carrier is the solution to the problem after all the research I have done, but would like confirmation first from the experts.
Regards
Rj

On mirror.lolinet.com, 109-52-10 belongs to Retail Apac. The newest rom was uploaded is 109-52-12.
If your unlocked bootloader phone is still running the stock firmware, it will be notified when OTA comes.
I'm using an ATT with carrier unlocked so everything is fine to me. With unlocked carrier, you can use any mobile network if the phone baseband supports.
According to basic theory, if the phone was unlocked bootloader, it can be flashed fw from other variants (but there will be problem for each variant situation). It seems none of us here has done this yet.
- Check your phone model, it's on the right of the charger port.
- Open Phone, and type: *#*#4636#*#*. Choose Phone info. Check the preferred network type. If you can receive sms but cannot send, just update your SMSC number.
Most problems can be solved by flashing the stock fw.
Good luck!!!

Thank you
I didn't even know that site until you pointed it out.
I would be definitely be using the APAC software and try and flash the stock rom. I hope it would work and if not I'll try and flashing the older patch version.
Thank you
Will update you hopefully in a week as soon as I fully understand the details of flashing.

Radioband Issue, RETCN and Stockrom app Fix
mr_5kool said:
On mirror.lolinet.com, 109-52-10 belongs to Retail Apac. The newest rom was uploaded is 109-52-12.
If your unlocked bootloader phone is still running the stock firmware, it will be notified when OTA comes.
I'm using an ATT with carrier unlocked so everything is fine to me. With unlocked carrier, you can use any mobile network if the phone baseband supports.
According to basic theory, if the phone was unlocked bootloader, it can be flashed fw from other variants (but there will be problem for each variant situation). It seems none of us here has done this yet.
- Check your phone model, it's on the right of the charger port.
- Open Phone, and type: *#*#4636#*#*. Choose Phone info. Check the preferred network type. If you can receive sms but cannot send, just update your SMSC number.
Most problems can be solved by flashing the stock fw.
Good luck!!!
Click to expand...
Click to collapse
Just giving people update incase anyone is interested. I decided to follow this guide Step E (reflashing back to stock). It worked perfectly for me.
https://forum.xda-developers.com/z2-force/how-to/guides-bootloader-twrp-custom-roms-root-t3805737
As you guys know the original Build number was OPXS27.109-52-10. It turns out that was meant for model XT1789-06. It wouldnt be a big deal except my model that arrived was for XT1789-05
Regardless I followed the instructions and installed the latest firmware for OPSC27.109-52-14 for XT1789-06 (https://mirrors.lolinet.com/firmware/moto/nash/official/RETAPAC/)
Installation went fine and all the apps crashing issues went away. However 4G still didnt work.
I decided to see if installation the latest build for XT1789-05 under the link below would help.
https://mirrors.lolinet.com/firmware/moto/nash/official/RETAIL/
It felt more stable, apps not crashing, moto mods still working, and I was able to get get 4G working for internet and sms however phonecalls (both outgoing and incoming) still didnt work. 3G seems to be still stable and working fine at the moment in the Philippines. (note: I have updated APN)
I have decided to leave it alone as I got half my problem sorted (apps crashing) and moto mods still working. Can live without 4G as its mostly connected to WIFI at home and occasionally going out. Crashing apps was more important win for me.
Maybe once Android 9 officially comes out for the phone, it may fix the issue.
I have explored the option of changing the radioband but I heard of nightmares for some users when they switched to USA. I dont know what will happen if I switch to Australia radioband. (i left it to automatic at this time).
Maybe if someone else found the solution, would be happy to try it out.

I'm sorry for you when you still have some problems. My friends mostly use Z2F form T-mobile and Sprint. ATT and Verizon are less. But they work well for all functions.
There's another way you can try. It's the method for dual sim. For eg, you've a Sprint one. You modded the hardware and the 2nd SIM slot is now available. But current Sprint fw only supports single SIM. You can download a dual sim fw, extract it and copy-replace the modem from Sprint fw to dual sim one (I dont remember exactly what modem should keep, sorry). Then, flash the combination fw and the phone runs with dual sim. You can try a stable system and retcn modem or vice versa.

mr_5kool said:
I'm sorry for you when you still have some problems. My friends mostly use Z2F form T-mobile and Sprint. ATT and Verizon are less. But they work well for all functions.
There's another way you can try. It's the method for dual sim. For eg, you've a Sprint one. You modded the hardware and the 2nd SIM slot is now available. But current Sprint fw only supports single SIM. You can download a dual sim fw, extract it and copy-replace the modem from Sprint fw to dual sim one (I dont remember exactly what modem should keep, sorry). Then, flash the combination fw and the phone runs with dual sim. You can try a stable system and retcn modem or vice versa.
Click to expand...
Click to collapse
Nothing to be sorry about, actually really grateful for your input.
Already had a big win by:
1. flashing for the first time ever to stock rom and not bricking my phone in the process
2. all apps are now working
3. moto mods are working
4. alternative solution to 4g issue is available
Just letting you know the my variant already is on dual sim, and I was pretty sure the modem was wiped and reinstalled when I reflashed back to stock. I did find another thread of similar issue. Only solution was really to either change to 3G or fix APN.
https://forums.lenovo.com/t5/Moto-Z...ing-Incoming-and-outgoing/td-p/4068998/page/2
One user commented it could be a carrier issue. (see below)
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07-13-2018 08:41 AM
Hello, guys.!
I've been following this inquiry very close and I've arrived into a very accurate conclusion:
1. This is not a device problem! Motorola devices are not the problem. I've found that Samsung and Huawei devices also have the same problems.
2. This is definitely about service provider network. In my investigation, AT&T is the one having this issue alone.
3. This issue happens only in certain Mexican areas. For example, in Monterey this happens. I went to Chihuahua and CD Juarez just last 3 days and I was able to use 4G and calls without problems.
4. Based on the idea that only happens in certain areas at certain networks, I can only concluded that happens to certain devices as well. Brands, perhaps, as unlocked iPhone does not present this issue.
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It could be something to do with Volte 4G calls. It has been disabled for the Xforce 1789-05 european models.
I think waiting to Android 9 may be my best solution though I may start try to start troubleshooting and focusing on simcards to see if 4g will work with other carriers.

I've got an ATT Flipout. I could make call and sms normally. But the network could only rise to E+, cannot be up to 3G (several years ago). The problem was phone hardware. The baseband was only available for US.
Z2F was the flagship, so its modem supported many 4G band for other regions.
As you mentioned, I think you should find out what carrier's band would suit your Z2F. Luckily, all Z2F variants have our bands.
Good luck, guy! And hope you'll give us good news!

You have the (05) dual sim variant correct? You're also in the Philippines right? If you look at this link you'll see all the bands supported for your variant, also you can check carriers in your region to see what bands they are using.
If you look carriers in Philippines like Smart you can see what bands they use.
A comparable carrier is Claro in Brazil.
They use the same bands on a GSM network. I would assume that Retail firmware would open those bands, but I'm not 100% sure and maybe the firmware you flashed doesn't. I do see firmware for RETBR (retail Brazil) and I know that (05) variants are used there. So maybe flashing a retbr firmware will open the bands needed since Brazil and Philippines use some of the same bands. I'm not 100% sure on this, it's just my best guess. You're welcome to verify the info linked and do what you will. I'd think the worst case scenario would be borking your imei and having to blankflash, but those tools are around here as well and so long as you DO NOT relock your bootloader you'll find that it is pretty hard to actually brick this phone. That's the best I can come up with to help.

Thank you
41rw4lk said:
You have the (05) dual sim variant correct? You're also in the Philippines right? If you look at this link you'll see all the bands supported for your variant, also you can check carriers in your region to see what bands they are using.
If you look carriers in Philippines like Smart you can see what bands they use.
A comparable carrier is Claro in Brazil.
They use the same bands on a GSM network. I would assume that Retail firmware would open those bands, but I'm not 100% sure and maybe the firmware you flashed doesn't. I do see firmware for RETBR (retail Brazil) and I know that (05) variants are used there. So maybe flashing a retbr firmware will open the bands needed since Brazil and Philippines use some of the same bands. I'm not 100% sure on this, it's just my best guess. You're welcome to verify the info linked and do what you will. I'd think the worst case scenario would be borking your imei and having to blankflash, but those tools are around here as well and so long as you DO NOT relock your bootloader you'll find that it is pretty hard to actually brick this phone. That's the best I can come up with to help.
Click to expand...
Click to collapse
Your correct, its the dual sim 05 variant. I flashed the retail and I do get LTE data. It just the LTE wont work on 4G. So I dont think its purely a band issue because based on your link I have 3 supported LTE bands with the smart network. Its possible its something to do with carrier communicating with the phone. (APN? Volte?)
Question: will flashing a retbr on a retcn cause issue? Does software channel matter? Maybe I can give it a go, but my wife (who i gave the phone to) has been pretty happy with it. I dont think she wants another wipe on her phone. (i think i already reformatted at least 5 times already)

Update
I found this thread with moto z play.
Maybe this will work? It a method to open all baseband channels.
https://forum.xda-developers.com/moto-z-play/how-to/enabling-basebands-mzp-qualcomm-phone-t3684962

harkoliar said:
I found this thread with moto z play.
Maybe this will work? It a method to open all baseband channels.
https://forum.xda-developers.com/moto-z-play/how-to/enabling-basebands-mzp-qualcomm-phone-t3684962
Click to expand...
Click to collapse
I don't know about all that, looks like a recipe for trouble. Are you able to make or receive voice calls? FYI you can go to apn settings, click the 3-dot menu and reset to default. That should pull your apn info from your sim so you should be good to go apn wise.

There was an old method called RadioComm. It used to unlock carrier for Razr HD (and maybe others Motorola phones). But it is more danger than flashing fw.
On my Verizon phones, no APN profile was showed. But on ATT Z2F, APN was automatically set (and showed) for each carrier.

Inbound and outbound calls affected
41rw4lk said:
I don't know about all that, looks like a recipe for trouble. Are you able to make or receive voice calls? FYI you can go to apn settings, click the 3-dot menu and reset to default. That should pull your apn info from your sim so you should be good to go apn wise.
Click to expand...
Click to collapse
Unfortunately still a no go.
I have reset the network settings and used default apn as per your suggestion. I even copied settings from another phone using same carrier and used different calling apps. It's weird but when at 4g
1. Text work
2. Data works
3. Inbound and outbound phone calls doesn't work
Swap to 3g everything works
I'm still trying to convince my wife if I should flash to retbr.

harkoliar said:
Unfortunately still a no go.
I have reset the network settings and used default apn as per your suggestion. I even copied settings from another phone using same carrier and used different calling apps. It's weird but when at 4g
1. Text work
2. Data works
3. Inbound and outbound phone calls doesn't work
Swap to 3g everything works
I'm still trying to convince my wife if I should flash to retbr.
Click to expand...
Click to collapse
Well if everything works on 3g then it sounds like your bands are fine. Sounds more like a volte issue. 4g works, 3g works, calling works, it's just no calls when 4g is on. Are you using an old sim? Have you tried the sim in another phone to see if you experience the same problems with 4g? Some carriers use different sim for different services. What is your preferred network type set to? If it's exclusively LTE, try setting it to LTE/GSM. It sounds more like a sim issue, setting issue, or maybe a registration issue.

41rw4lk said:
Well if everything works on 3g then it sounds like your bands are fine. Sounds more like a volte issue. 4g works, 3g works, calling works, it's just no calls when 4g is on. Are you using an old sim? Have you tried the sim in another phone to see if you experience the same problems with 4g? Some carriers use different sim for different services. What is your preferred network type set to? If it's exclusively LTE, try setting it to LTE/GSM. It sounds more like a sim issue, setting issue, or maybe a registration issue.
Click to expand...
Click to collapse
I dont think its a old sim issue because its only a year old. But I am getting another simcard from another local network to test it out.
Will update with details.

Hello harkoliar, it looks like both you and I share the exact problem. And best of all, or worst depending on how you view it, I am in Malaysia with the same problems, Grab keeps crashing, among other apps just failing to work period.
Software Channel reads RETCN. 05 phone running an 06 firmware.
I noticed you tried to flash a RETAIL firmware, may I know which was the file you used, was it OPXS27.109-34-21?
I don't have much problems with the connectivity and using 4G. Perhaps it may be a difference between telcos in Malaysian and the Philippines.
Oh... And I bought mine from Lazada, where did you get yours. LOL

frozero said:
Hello harkoliar, it looks like both you and I share the exact problem. And best of all, or worst depending on how you view it, I am in Malaysia with the same problems, Grab keeps crashing, among other apps just failing to work period.
Software Channel reads RETCN. 05 phone running an 06 firmware.
I noticed you tried to flash a RETAIL firmware, may I know which was the file you used, was it OPXS27.109-34-21?
I don't have much problems with the connectivity and using 4G. Perhaps it may be a difference between telcos in Malaysian and the Philippines.
Oh... And I bought mine from Lazada, where did you get yours. LOL
Click to expand...
Click to collapse
Same Lazada. Lol. We must have gotten from the same supplier.
Your right, I installed OPXS27.109-34-21. Worked like a charm after that. Please follow the steps provided in the guide - Step E.
https://forum.xda-developers.com/z2-force/how-to/guides-bootloader-twrp-custom-roms-root-t3805737
note: be mindful just what version of android your using. Im assuming its also android 8 like mine. If its currently Android 7, i heard its best to install the android 7 rom first then upgrade to 8. You can tell by the versions.
Another user also having the same problems and reinstalled the latest Retail ROM for XT1789-05 - latest version, worked for him as well
https://forum.xda-developers.com/z2-force/help/internet-issue-apps-xt1789-05-t3924795/page2
Please let us know how you go.

harkoliar said:
Same Lazada. Lol. We must have gotten from the same supplier.
Your right, I installed OPXS27.109-34-21. Worked like a charm after that. Please follow the steps provided in the guide - Step E.
https://forum.xda-developers.com/z2-force/how-to/guides-bootloader-twrp-custom-roms-root-t3805737
note: be mindful just what version of android your using. Im assuming its also android 8 like mine. If its currently Android 7, i heard its best to install the android 7 rom first then upgrade to 8. You can tell by the versions.
Another user also having the same problems and reinstalled the latest Retail ROM for XT1789-05 - latest version, worked for him as well
https://forum.xda-developers.com/z2-force/help/internet-issue-apps-xt1789-05-t3924795/page2
Please let us know how you go.
Click to expand...
Click to collapse
Just finished flashing! So far so good, installing apps as we speak! Super excited!
Was your seller named Aukey? I left them a stinker of a review, lol.
Thank you so much for your experience and detailed breakdown of what you did to get right with your, now, wife's phone. :laugh::fingers-crossed::victory:

Different seller but same source most likely
Different seller but same source most likely.
Happy to help and hopefully that did fix all your app problems. :good:
Still credits and thanks to the actual guys who did the guide.

frozero said:
Just finished flashing! So far so good, installing apps as we speak! Super excited!
Was your seller named Aukey? I left them a stinker of a review, lol.
Thank you so much for your experience and detailed breakdown of what you did to get right with your, now, wife's phone. :laugh::fingers-crossed::victory:
Click to expand...
Click to collapse
AUKEY owns coolicool. Same supplier keeps making the same mistake