Develop Bugs

LTE not in the list

Hi. I am using a E97510D stock rom, I just noticed that LTE is not in the list, just GSM and WCDMA. Anyone knows why? Thanks!

are you sure u use the correct rom then? if yes, u should see if u can get a modem for ur phone then...
modem can be downloaded here, but installing i dunno: http://downloads.codefi.re/houstonn/lgog/modem

puma99dk| said:
are you sure u use the correct rom then? if yes, u should see if u can get a modem for ur phone then...
modem can be downloaded here, but installing i dunno: http://downloads.codefi.re/houstonn/lgog/modem
Click to expand...
Click to collapse
Thanks for the info. I have the correct rom as far as I know, I also have a modem.img, but I don't know how I can flash it. Anyone care to help?

Interesting...I think I have this problem as well. I got my E975 here in the UK last week running 10E out of the box, and I have no LTE option, however my sim/network is only 3G capable at the moment. Do the options dynamically change with a 4G SIM or would I have to flash something?

jpxdude said:
Interesting...I think I have this problem as well. I got my E975 here in the UK last week running 10E out of the box, and I have no LTE option, however my sim/network is only 3G capable at the moment. Do the options dynamically change with a 4G SIM or would I have to flash something?
Click to expand...
Click to collapse
I presume it's not SIM or Network related. As when I used a Custom ROM, like Avatar ROM, I get all list of available networks(LTE/GSM/WCDMA). But reverting to stock one gives me two options only.

On stock rom you will have to wait for operator update to enable acces to lte. My g came with 10c. After 2 weeks i received notification about an update(about 10mb)..after this update i had acces to lte. So,maybe you have to wait?
Sent from LG E975 pwd by CM 10.2

kimitza said:
On stock rom you will have to wait for operator update to enable acces to lte. My g came with 10c. After 2 weeks i received notification about an update(about 10mb)..after this update i had acces to lte. So,maybe you have to wait?
Sent from LG E975 pwd by CM 10.2
Click to expand...
Click to collapse
I just tested this: First I don't have the LTE option, then I tried flashing a modem for my phone. After that I lost my network connection, then I flashed the baseband again from my PC. And guess what? LTE appears, network connections' good, wifi is great! :laugh: :good:

try this..is simple: http://forum.xda-developers.com/showthread.php?p=42892508
Sent from my LG-E975 using xda app-developers app

This 'trick' also lets me select the LTE option, however I haven't tested with a 4G capable carrier yet. Looking forward to trying this out properly

Baseband problem, flashed wrong thing

Alrighty .. I have an big problem .. So i got LG Optimus G E975 International version , and i got this phone from Estonia , as i live here myself.. so 3-4 days ago i saw this post where there is android 4.4.2 for LGOG of course i dumbhead thought that it works for E975 and flashed the F180L or S baseband .. and modem and everything it was the patch file.. so now the android did work .. it booted up and everything was fine but no signal! And then i thought well im just going to go to download mode, flash original KDZ with my IMEI .. and i did hard reset after flashing and the original android does work, but also no signal, then.. i thought i would flash the modem for E975 and i flashed the 10b modem for E975 and now i still dont have signal at home , or country places but on citys i do get signal now.. but i would want to restore phone so it works like it used to be, and have signal everywhere else too.. i can't think of what to do nolonger, but i would need the modem and baseband and other things from other LG E975 default rom , etc so i could restore my phone..
Ohh and im pretty sure that problems started when i used this tutorial: http://forum.xda-developers.com/showthread.php?t=2762171 . And i was on that stock ROM before i started upgrading to 4.4.2.
Thank you very much for your time, and i hope you have an awesome weekend!
Also im sorry for my bad english, because im from Estonia and english isn't my mother language.

Linnamees said:
Alrighty .. I have an big problem .. So i got LG Optimus G E975 International version , and i got this phone from Estonia , as i live here myself.. so 3-4 days ago i saw this post where there is android 4.4.2 for LGOG of course i dumbhead thought that it works for E975 and flashed the F180L or S baseband .. and modem and everything it was the patch file.. so now the android did work .. it booted up and everything was fine but no signal! And then i thought well im just going to go to download mode, flash original KDZ with my IMEI .. and i did hard reset after flashing and the original android does work, but also no signal, then.. i thought i would flash the modem for E975 and i flashed the 10b modem for E975 and now i still dont have signal at home , or country places but on citys i do get signal now.. but i would want to restore phone so it works like it used to be, and have signal everywhere else too.. i can't think of what to do nolonger, but i would need the modem and baseband and other things from other LG E975 default rom , etc so i could restore my phone..
Ohh and im pretty sure that problems started when i used this tutorial: http://forum.xda-developers.com/showthread.php?t=2762171 . And i was on that stock ROM before i started upgrading to 4.4.2.
Thank you very much for your time, and i hope you have an awesome weekend!
Also im sorry for my bad english, because im from Estonia and english isn't my mother language.
Click to expand...
Click to collapse
Try to flash the european modem from here:http://downloads.codefi.re/houstonn/lgog/modem/E975_E977_E976

grunch21 said:
Try to flash the european modem from here:
Click to expand...
Click to collapse
That is actually what i did, after i was like: hell i don't have no internet connection.. that was first thing i tried to do, go and search for modem, and that modem works.. but signal strenghts are too low for it to work correctly, i used to have atleast EDGE with 4-5 bars, but now i do not even have edge on countryside.. and only 3G and it works only at citys, so that modem didn't help much.

Linnamees said:
That is actually what i did, after i was like: hell i don't have no internet connection.. that was first thing i tried to do, go and search for modem, and that modem works.. but signal strenghts are too low for it to work correctly, i used to have atleast EDGE with 4-5 bars, but now i do not even have edge on countryside.. and only 3G and it works only at citys, so that modem didn't help much.
Click to expand...
Click to collapse
Sorry mate, didn't read it carefully. What Rom are you using? Maybe tweaking build.prop would help.

I've gote the exact same problem. I think its an efs thing though. PLEASE SOMEONE HELP. Very weak to no signal after flashing f180 kitkat an returning to stock E97510H. Nothing i can do!

[Q] What is going on with my LTE (after downgrading to KK from L)??

A bit of background on my device - I have a D855 from HK. I flashed the rooted Lollipop by @Skin1980 but decided to go back to KK. While on L, my LTE didn't work. Now that I've downgraded to KK, if I have the phone set to LTE/GSM/WCDMA, the phone will boot up with LTE working. As soon as I go into the Phone Info screen to change it to WCDMA preferred, it will go on H+. If I want to go back to LTE, the phone pick up the LTE signal for half a second and then lose it. The only way I can get it to get back on LTE is if I reboot the phone.
The reason I do this is because I get a better H+ signal in most places than I do the LTE signal so I leave it on H+ to conserve battery life as I'm mostly on wifi and I change it to LTE when I need to download large files when I'm not on wifi.
I have already flashed the KK Modem file that was provided by @Skin1980. This never happened before I upgraded to L and then downgraded back to KK. Does this happen to anyone else who has downgraded and does anyone know how to fix this?

Try flashing the kk modem a couple more times, for some reason modems can be a bit tricky and dont always flash properly, can some times take several flashes before they seem to stick
if this doesnt work then maybe the modem is for the international d855 and not for the hk rom your using?
Sent from my LG-D855 using XDA Free mobile app

rosso22 said:
Try flashing the kk modem a couple more times, for some reason modems can be a bit tricky and dont always flash properly, can some times take several flashes before they seem to stick
if this doesnt work then maybe the modem is for the international d855 and not for the hk rom your using?
Sent from my LG-D855 using XDA Free mobile app
Click to expand...
Click to collapse
I tried installing it several times but it didn't help. I wasn't aware there was more than one modem for different regions. I was always on an HK modem before and it works here in the UK. But after I applied the KK modem skin1980 provided for downgrading to KK from L, I started seeing this issue.
If I turn the radio off and then back on, it'll lock onto an LTE signal some of the time. But if I set the modem to LTE only, it will find the LTE signal for half a second, then lose it and cannot find it again....

Well it sounds like the same sort of problem some get using the lp modem on kk rom, maybe try installing a custom rom like cloudy if your models supported, failing that try a full wipe and flash kdz again
Sent from my LG-D855 using XDA Free mobile app

Japultra said:
A bit of background on my device - I have a D855 from HK. I flashed the rooted Lollipop by @Skin1980 but decided to go back to KK. While on L, my LTE didn't work. Now that I've downgraded to KK, if I have the phone set to LTE/GSM/WCDMA, the phone will boot up with LTE working. As soon as I go into the Phone Info screen to change it to WCDMA preferred, it will go on H+. If I want to go back to LTE, the phone pick up the LTE signal for half a second and then lose it. The only way I can get it to get back on LTE is if I reboot the phone.
The reason I do this is because I get a better H+ signal in most places than I do the LTE signal so I leave it on H+ to conserve battery life as I'm mostly on wifi and I change it to LTE when I need to download large files when I'm not on wifi.
I have already flashed the KK Modem file that was provided by @Skin1980. This never happened before I upgraded to L and then downgraded back to KK. Does this happen to anyone else who has downgraded and does anyone know how to fix this?
Click to expand...
Click to collapse
delete the lteconfig files from system/app or system/privapp

suljo94 said:
delete the lteconfig files from system/app or system/privapp
Click to expand...
Click to collapse
Thanks for the suggestion but unfortunately, this didn't work.

rosso22 said:
Well it sounds like the same sort of problem some get using the lp modem on kk rom, maybe try installing a custom rom like cloudy if your models supported, failing that try a full wipe and flash kdz again
Sent from my LG-D855 using XDA Free mobile app
Click to expand...
Click to collapse
That's my last resort, but I guess I'll have to try it. Thanks.

rosso22 said:
Well it sounds like the same sort of problem some get using the lp modem on kk rom, maybe try installing a custom rom like cloudy if your models supported, failing that try a full wipe and flash kdz again
Sent from my LG-D855 using XDA Free mobile app
Click to expand...
Click to collapse
I just did a CSE flash and the problem still persists.... Are there any other options I haven't thought of to do?

Dunno then, try the custom rom route maybe, or possibly its the kdz your using, might be wrong one, when i went back to stock before i downloaded mine from the lg site where you put your imei number in so you get the exact firmware for your phone, not sure of the link for the site though sorry matey
Sent from my LG-D855 using XDA Free mobile app

rosso22 said:
Dunno then, try the custom rom route maybe, or possibly its the kdz your using, might be wrong one, when i went back to stock before i downloaded mine from the lg site where you put your imei number in so you get the exact firmware for your phone, not sure of the link for the site though sorry matey
Sent from my LG-D855 using XDA Free mobile app
Click to expand...
Click to collapse
That's actually the version I flashed. Thanks for your help.

Not getting connected to 4G in the US on Global Rom

Hi Guys,
Spend a bunch of time with AT&T trying to get this phone on the data network here in the USA. When the phone first boot I can get on the data network for about 15 seconds and then it seems to get blocked or something.
I'm just wondering if this is because its the fake global rom? 9.6.4.0.
It shows as connected and on 4G for AT&T but only calls and texts work, no data. AT&T said that the IMEI number was showing incorrectly and that they had to add it to their system, so it sounds like this is a carrier issue and not ROM issue but just wanted to be sure.
Also as far as the sim card slots, I wanted to use an sd card so that means I need to put the sim in the 2nd sim slot. In the phone it shows 2 IMEI numbers, one of which is 14 characters and the other is 15 characters. AT&T made it sound like a 14 character IMEI was invalid in the US. The odd part is that the IMEI numbers changes slots as I move the SIM card around. the 14 character IMEI number will move to where ever the SIM is installed. Not sure if this matters or not either.
If I reboot the phone I get data for like 15 seconds again and then is stops.
Any ideas on this one? Just wanted to make sure this isn't something up with the fake rom installed (phone was already unlocked when I got it)

So just for good measure I went ahead and flashed the global 9.6.6.0 rom that was release today.
AT&T cannot seem to get this phone activated on their network at all... I get 4G showing in the notification bar, but I cannot get any voice or data.
I know some of you guys have this phone running on AT&T, are you using global roms? Could that have anything to do with me not getting signal? Is it worth trying to flash a chinese rom as well?
I sort of feel this is a carrier issue, but I am certainly not sure.

omniphil said:
So just for good measure I went ahead and flashed the global 9.6.6.0 rom that was release today.
AT&T cannot seem to get this phone activated on their network at all... I get 4G showing in the notification bar, but I cannot get any voice or data.
I know some of you guys have this phone running on AT&T, are you using global roms? Could that have anything to do with me not getting signal? Is it worth trying to flash a chinese rom as well?
I sort of feel this is a carrier issue, but I am certainly not sure.
Click to expand...
Click to collapse
Did you try the volte enabler in dialer? *#*#86583#*#*
Also, are your apn settings correct?

The modem of the global rom is currently broken, nothing will help.
I suggest installing 9.6.11.0 China stable (no ARB) from fastboot and then downgrade to 9.6.6.0 Global using the antirollback method
your modem will work perfectly

omer919 said:
The modem of the global rom is currently broken, nothing will help.
I suggest installing 9.6.11.0 China stable (no ARB) from fastboot and then downgrade to 9.6.6.0 Global using the antirollback method
your modem will work perfectly
Click to expand...
Click to collapse
Ok, I will certainly give that a whirl. It certainly does feel like the modem is not working...
Do I have to downgrade to 9.6.6.0? No harm in staying on the 9.6.11.0 china rom? (Or does it not support English at all?)
I have been unsuccessful getting flashing to work over fastboot, so I must be missing something there. Can I just flash via TWRP? that's already installed and working?

opasha said:
Did you try the volte enabler in dialer? *#*#86583#*#*
Also, are your apn settings correct?
Click to expand...
Click to collapse
Yup, I did try both of those....

omniphil said:
Ok, I will certainly give that a whirl. It certainly does feel like the modem is not working...
Do I have to downgrade to 9.6.6.0? No harm in staying on the 9.6.11.0 china rom? (Or does it not support English? at all)
I have been unsuccessful getting flashing to work over fastboot, so I must be missing something there. Can I just flash via TWRP? that's already installed and working?
Click to expand...
Click to collapse
I have been using China Stable 9.6.11.0. and it's 95% english. Works fine as a daily driver.

4z4 said:
I have been using China Stable 9.6.11.0. and it's 95% english. Works fine as a daily driver.
Click to expand...
Click to collapse
Excellent, Ok, I will flash the 9.6.11.0 in TWRP and hopefully that makes the mode work again.
Thank you guys!

Ok, I now have a working radio after flashing the 9.6.11.0 !!!!! Thank you guys! Data and Voice are now working on AT&T.
So if I wanted to go to the global 9.6.6.0, can i just flash that over this in TWRP?

omniphil said:
Ok, I now have a working radio after flashing the 9.6.11.0 !!!!! Thank you guys! Data and Voice are now working on AT&T.
So if I wanted to go to the global 9.6.6.0, can i just flash that over this in TWRP?
Click to expand...
Click to collapse
Yes, that's what omer919 said would work.

opasha said:
Yes, that's what omer919 said would work.
Click to expand...
Click to collapse
Sounds too easy, but i'll give it a try, lol....
I figure that encrypted partition will be problematic...
I still have the issue where TWRP never stays, I have to flash it via ADB everytime i want to use it. Anf then it only works once and is gone.
EDIT, yeah, that certainly didnt work. Phone boots to a password screen, I really hate encryption and this is why...

Try this:
https://forum.xda-developers.com/mi-max-3/help/help-t3839214

samkatta said:
Try this:
https://forum.xda-developers.com/mi-max-3/help/help-t3839214
Click to expand...
Click to collapse
I'm not getting anything like that. I just did a format of the data and flashed 9.6.6.0. Its just sitting at the android loading screen now, so that didnt work either.
But at least I know that the chinese rom does work. That's a plus, now just to get over to global rom somehow...

wow, it works with att? u getting H or LTE? what city u in? i want to check the city bands

Again, your modem is broken, nothing will help on software part.
if you want china rom, with china bloatware no multilanguage and GAPPS not working good go for it and just stay on china stable.
if you want to install global rom again while having a working modem follow the guide: here

ryanllts said:
wow, it works with att? u getting H or LTE? what city u in? i want to check the city bands
Click to expand...
Click to collapse
I'm in New Hampshire. Its just 4G in this area, but I suspect it will connect to LTE in the appropriate areas.

I have a question regarding 4g. My device shows only LTE instead of 4g. Seems to have quick connection. In theory they are the same but just wondering if anyone having the same?

shadow78 said:
I have a question regarding 4g. My device shows only LTE instead of 4g. Seems to have quick connection. In theory they are the same but just wondering if anyone having the same?
Click to expand...
Click to collapse
I go between 4G and LTE areas (home and work). The phone shows the appropriate connection at each location, They are definitely different things.

omniphil said:
I go between 4G and LTE areas (home and work). The phone shows the appropriate connection at each location, They are definitely different things.
Click to expand...
Click to collapse
Thx what fw are you using? I remember when I had the chinese stable and even before the EU I had 4g showing up. But now even when I go to settings I can only chose LTE and 3g. No 4g option.

shadow78 said:
Thx what fw are you using? I remember when I had the chinese stable and even before the EU I had 4g showing up. But now even when I go to settings I can only chose LTE and 3g. No 4g option.
Click to expand...
Click to collapse
I had the 9.6.4.0 and the 9.6.6.0 global roms, those both had broken modems, no internet access.
I also tried the trick of putting on the chinese rom 9.6.11.0 and then flashing over to the firmware less 9.6.6.0 global. Still broken modem.
The only way I can get working data is to use a chinese rom. These have all worked.
I was on 8.8.9 miui 10, which I then upgraded to 8.9.6. After that I dirty flashed the xiaomi.eu 8.9.6 rom over that. All of those have working radios.
I guess i'm not too concerned about flashing the newer anti-rollback roms anymore, since there is a guide on how to roll back if you need to. But so far on the chinese miui 10 roms the only issue I seem to have is Android Auto not working and Textra (3rd party text app) not keeping its notification alive.

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