Database Develop

Z3 Compact from Docomo Japan (SO-02G) - NFC firmware update Failed (-1)

Hi,
Are there any known issues when flashing a Docomo branded Z3c (SO-02G) with the generic FW (D5803)?
As usual after resetting the phone it tries to update the NFC firmware. But that fails with "NFC firmware update Failed (-1)".
Is this a known phenomenon? Is the Docomo version any different than the generic one?

I attempted to install Android 6.0.1, and after two days I have not seen any problems. Only nfc. Does not work

Please Share Globle Firmware For SO-02G I Need it urgent Please Help !

FaizanChauhaan said:
Please Share Globle Firmware For SO-02G I Need it urgent Please Help !
Click to expand...
Click to collapse
still need SO-02G Global firmware?

FaizanChauhaan said:
Please Share Globle Firmware For SO-02G I Need it urgent Please Help !
Click to expand...
Click to collapse
i used to flash original SO-02G 5.0.2 firmware, NFC driver installed but cant be used. i read somewhere, said that NFC only working if you're in docomo network and using docomo simcard

wede6 said:
i used to flash original SO-02G 5.0.2 firmware, NFC driver installed but cant be used. i read somewhere, said that NFC only working if you're in docomo network and using docomo simcard
Click to expand...
Click to collapse
The nfc still works outside Japan and without using docomo uim. Try to update using Wi-Fi to latest firmware using OTA

No, it won't work with D5803 version
mjosephabie said:
The nfc still works outside Japan and without using docomo uim. Try to update using Wi-Fi to latest firmware using OTA
Click to expand...
Click to collapse
Any Japanese SO-02G with D5803 firmware won't have NFC usable. If you want to use NFC, then buy an original non-Japanese Z3C handset and you can change its OS to UK, US or Global without facing any problem.
Btw is the problem still there with Z5, X Compact and other latest models made for Japanese DOCOMO Network or is it just Z3?

Hey guys you know you can downgrade your z3c with out unlocking the boot loader of device. Yes it really works. I downgraded my own device from mm 6.0.1 to lp 5.1.1 and it really works and much better battery ? timing now even with nfc firmware update failed on my docomo...
You can download lp 5.1.1 from here.
Xperiablog.net/forums
And enjoy...
One more thing. You can downgrade any Xperia device without unlocking the bootloader. Not just z3 compact only...
---------- Post added at 05:34 PM ---------- Previous post was at 05:08 PM ----------
I need help. I wanna know that is it possible to disable nfc on my Xperia z3c docomo without rooting the device.
It's root procedure is so complicated and some says that it can't be root without unlocking the bootloader which manufacturer didn't allow on this device....

Flashing generic UK firmware from O2 - complete n00b request

Hi,
I'm in the UK; have an Xperia 1 II from O2. Bought outright and using my EE sim in the phone. I am investigating the possibility of flashing generic UK firmware (i.e. to match the firmware on the phones sold direct from Sony) so that EE wifi calling hopefully starts to work. Phone is unlocked.
I've never flashed a phone before and am trying to figure out how it works.
My understanding is:
1. can obtain firmware via Xperifirm
2. can flash that firmware using Flashtool
3. don't need to unlock bootloader to flash new firmware.
My questions are:
4. is it as simple as the above? Download my selected firmware and then flash using Flashtool?
5. is Flashtool a third party software? I see the Sony dev site also offers a flash tool called Emma. I have also seen references to a separate Newflasher and the need for an fsc script
6. how do I confirm which firmware is which? I presume I would be looking to use the 'Customized UK' firmware listed in Xperifirm, CDA 1321-7192 / 58.0.A.3.31 / R8A.
Thanks, appreciate any info.
Cheers,
Michael

I posted how I did it here and in this simpler guide here.
Your understandings are correct. FlashTool includes XperiFirm.
4. Yes, though you will have to do a couple of additional steps because the FlashTool devices database has not been updated with the .fsc for the phone yet.
5. Yes, FlashTool is 3rd party software and allows you to change Customization. Emma is only for unlocked bootloaders from what I remember. You will need to also download the .fsc and .properties files I provided and rename the .fsc file.
6. Yes, 'Customized UK' from XperiFirm is what you want.
On Windows you will need to install the Flashmode and Fastboot drivers in the Flashtool\drivers directory to communicate with your phone. Follow the instructions here as you need to start Windows with driver signature enforcement disabled to do this.
Once you have that all set up, downloaded the firmware and FlashTool has processed the downloaded firmware, you will be ready to flash. Click Flash and choose Flash Mode, then set it up as in my first link - this will wipe all data on the phone.
When flashing, an error of "those files are not in the fsc script: persist, reset-non-secure-adb" is entirely normal. When flashing has finished successfully it will say "synced".

Thanks heaps - I'll have a go.

O2 advised me the phone is unbranded and unlocked as if bought direct from Sony is this incorrect ??
---------- Post added at 07:27 PM ---------- Previous post was at 06:46 PM ----------
mcawle said:
Hi,
I'm in the UK; have an Xperia 1 II from O2. Bought outright and using my EE sim in the phone. I am investigating the possibility of flashing generic UK firmware (i.e. to match the firmware on the phones sold direct from Sony) so that EE wifi calling hopefully starts to work. Phone is unlocked.
I've never flashed a phone before and am trying to figure out how it works.
My understanding is:
1. can obtain firmware via Xperifirm
2. can flash that firmware using Flashtool
3. don't need to unlock bootloader to flash new firmware.
My questions are:
4. is it as simple as the above? Download my selected firmware and then flash using Flashtool?
5. is Flashtool a third party software? I see the Sony dev site also offers a flash tool called Emma. I have also seen references to a separate Newflasher and the need for an fsc script
6. how do I confirm which firmware is which? I presume I would be looking to use the 'Customized UK' firmware listed in Xperifirm, CDA 1321-7192 / 58.0.A.3.31 / R8A.
Thanks, appreciate any info.
Cheers,
Michael
Click to expand...
Click to collapse
I have bought mine on o2 also and will be using on three uk .. apart from wifi ifoes everything else function OK without o2 sim ?
To be honest I'm torn between cancelling o2 as they told me the phone was unlocked and unbranded and getting a s20 plus
Thanks in advance Mike

Hi,
It has an O2 app preinstalled. No branding or startup stuff. Everything is fine except no WiFi calling visible for EE, which I expected. I did talk to O2 a bit beforehand and they said the firmware would be specific but nothing else. It is unlocked, my EE SIM is working fine aside from WiFi calling as above.

mcawle said:
Hi,
It has an O2 app preinstalled. No branding or startup stuff. Everything is fine except no WiFi calling visible for EE, which I expected. I did talk to O2 a bit beforehand and they said the firmware would be specific but nothing else. It is unlocked, my EE SIM is working fine aside from WiFi calling as above.
Click to expand...
Click to collapse
I doubt you will get VoLTE/4G calling working on EE or 3 with the O2 firmware either. (At least it didn't work for me with a Vodafone SIM). To me VoLTE is much more important than WiFi calling as without VoLTE you cannot make a phone call on 4G and instead have to also have a connection to a 3G or 2G network to make a call.
Flashing the Customized UK firmware should fix this.

brocnical said:
I doubt you will get VoLTE/4G calling working on EE or 3 with the O2 firmware either. (At least it didn't work for me with a Vodafone SIM). To me VoLTE is much more important than WiFi calling as without VoLTE you cannot make a phone call on 4G and instead have to also have a connection to a 3G or 2G network to make a call.
Flashing the Customized UK firmware should fix this.
Click to expand...
Click to collapse
Yes exactly. WiFi calling not working on EE out of the box. Just need to take the time and get brave enough to do it!

Did you flash your Xperia 1ii? I have the same, O2 phone with EE sim , no wifi calling but everything else OK. I though it was working before the last Sony update but maybe it wasn't. I notice the mobile signal shows LTE but when I put an O2 sim in it says 4G. I didn't realise it was a firmware issue so looking at doing this. I need wifi calling at the back of my house as the mobile signal is very weak.

libboid said:
Did you flash your Xperia 1ii? I have the same, O2 phone with EE sim , no wifi calling but everything else OK. I though it was working before the last Sony update but maybe it wasn't. I notice the mobile signal shows LTE but when I put an O2 sim in it says 4G. I didn't realise it was a firmware issue so looking at doing this. I need wifi calling at the back of my house as the mobile signal is very weak.
Click to expand...
Click to collapse
Hi, yes I did using this wonderful thread: https://forum.xda-developers.com/sony-xperia-1-II/how-to/successfully-flashed-customization-t4119707
Read it first as there can be some scary moments depending on which usb-c cable you use to connect the phone to the pc (don't use the Sony one) but it all works if you follow the instructions and I now have WiFi calling over EE.

mcawle said:
Hi, yes I did using this wonderful thread: https://forum.xda-developers.com/sony-xperia-1-II/how-to/successfully-flashed-customization-t4119707
Read it first as there can be some scary moments depending on which usb-c cable you use to connect the phone to the pc (don't use the Sony one) but it all works if you follow the instructions and I now have WiFi calling over EE.
Click to expand...
Click to collapse
Thanks. I'll give that a shot over the weekend.
As an aside, if you got it from O2, did you get your 'free' headphones?

libboid said:
Thanks. I'll give that a shot over the weekend.
As an aside, if you got it from O2, did you get your 'free' headphones?
Click to expand...
Click to collapse
Good luck!
And yes I did get the headphones, a couple weeks back

Hi
I'm in same situation. Can you please confirm that you can change the mobile bands.
Ie. You can select it to change the preferred network type?
Like in pic below?
Thanks
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"lightbox_share": "Share",
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Sent from my XQ-AT51 using Tapatalk

Does this give you volte as well, or will it just give WiFi calling?

Rodders_28 said:
Does this give you volte as well, or will it just give WiFi calling?
Click to expand...
Click to collapse
Both

I need to do this then!
Chances of killing phone completely though.....?

Nil

Cheers!

mcawle said:
Good luck!
And yes I did get the headphones, a couple weeks back
Click to expand...
Click to collapse
I managed to flash to stock UK and now have Wi-Fi calling on EE - but - I have lost the ability to edit the APN. When I hotspot some apps get confused with IPv6 so I delete that from the EE APN but cant do it now I have flashed. Also lost LTE option. Just generic 5G/4G/3G/2G. Can you edit your APN and do you have LTE?
As for the headphones, good for you - still waiting for mine
---------- Post added at 07:32 PM ---------- Previous post was at 07:25 PM ----------
dvdman2k said:
Hi
I'm in same situation. Can you please confirm that you can change the mobile bands.
Ie. You can select it to change the preferred network type?
Like in pic below?
ThanksView attachment 5088133
Sent from my XQ-AT51 using Tapatalk
Click to expand...
Click to collapse
After flashing from O2 firmware to stock UK firmware I only have the one option of 5G/4G/3G/2G

Noob question but does flashing the firmware impact using NFC payments and Google pay?
Also does anyone know if/have experience of, the Hong Kong version (dual SIM), being able to use VOLTE/WiFi calling here in the UK? I need a dual SIM phone ideally but I read somewhere that flashing the dual SIM with a UK firmware will disable the second sim slot (which makes sense to me).
Thank you!

LTE is 4G isn't it. Does O2 just put LTE in their firmware rather than 4G?

VoLTE, VoWIFI, 5G - carrier settings by Sony

Hi all,
Support of Sony doesn't have any idea, how it works....:
I bought a EU-device and use it in Switzerland. Unfortunately, they didn't integrate the Swiss carrier settings. Due to this, I don't have VoLTE, VoWifi (Wifi calling) and 5G.
I contacted Sony by phone and they told me that the device seems to have defect, that's why it doesn't work. So I wrote an e-mail to Sony support and they answered that the hardware is only capable to have these functions for the countries it is build for. My reply was that this is an EU-Version, so the hardware isn't the problem, they just need to add the carrier settings and if they know, when they will add them. Answer of the support: No, it is the hardware.
It is really frustrating with Sony. They have build such a nice device, but with this support, they shoulnd't be suprised about falling sales.
I was thinking of open the bootloader with Magisk and try to add the settings by myself. But first, I have never done this and I am not sure yet, what I have to do exaclty (step by step). Second, I loose the guarantee. And third, I am not sure if banking apps still work afterwards.
I really love this device, but I am a little frustrated about Sony.
If you have an idea, how I can solve this problem, you would make me happy

Flash firmware with Volte support, that's all.
Envoyé de mon XQ-AT51 en utilisant Tapatalk

I tried this already (several different localizations), bitit didnt help. The problem is, that Swiss providers didn't integrate their settings into Googles carrier services, but into another database for manufacturers. Unfortunately, Sony didn't do that on the Xperia 1 ii (even if they did it on past Xperias).
But I am most frustrated, that their customer care blame it on the hardware, but it's a software problem. Even after explaining, they don't wanna check it with a specialist. So trumping something, which isn't true.

Maybe you should contact your provider. Unlocking bootloader won't help.
Envoyé de mon XQ-AT51 en utilisant Tapatalk

According to Swisscom, everything is ready and the system is waiting for the device to register in IMS. But as the mobil doesn't have the carrier datas, it probably can't do it.
So I am back at the point, where the mobile needs the settings implemented for Swisscom...

We need to wait for flash firmware with Volte support, that's all.
For now FlashTool is not supporting our device.
Later just flash US frimware you will loose double sim but you will get VoLTE and WiFi calling. I did that on Xperia 1. It was easy and satisfy choice

I have an XQ-AT51 and also tried the UK-version, which support VoLTE/VoWifi. But as mentioned, the carrier settings of Swiss providers are missing.

I really don't know if it can help, but, have you already tried this way? here

The mentioned switch in this post is greyed out on my phone and my phone is also not IMS-registered (even my provider is offering it - I have also a second SIM for the same number with an Xperia 10 Plus with VoLTE and VoWifi). So I am pretty sure, it is only about integrating providers/carriers settings. But as Sonys customer care doesn't care about it (only this sentence shows that something is wrong there) and they don't want to check it internally with an xpert on VoLTE/VoWifi, it is frustrating.

Hey PlatinCH, any news? Did you manage to get VoLTE/VoWifi working?
That's the only thing holding me back from buying it

Yes it is quite confusing for sony, i used to flash xz premium and xperia 1 with SEA firmware on my HK device and both able to use VOLTE and VOWIFI in Thailand. So i just wait for SEA firmware to release for Xperia 1 II and i flash it over to my Xperia 1 II (HK) last night. This is quite problem the volte button is there but not work, as well noticed that IMS is not registered although it trigger on but greyed out. I think pproblem is with Sony.
Anyhow i recommend to use New Flasher now as it support Xperia 1 II, and i am contributor to the dev since Xz Premium day so the dev is very updated and quick respond and it is simple and easy to use.

Question for the OP. Have a checked the modem config files to see if your carrier is listed in there? Also have you checked to see what modem config file your phone is currently using? Just type in *#*#service#*#* and go to service info, then choose software info. Your modem config will be listed at the bottom.

Quite sure it's listed there,
This phone will always select ROW Commercial config.
Don't know if this a bug or a feature from Sony

has anyone found a solutuion for wifi calling?

tanipat said:
Yes it is quite confusing for sony, i used to flash xz premium and xperia 1 with SEA firmware on my HK device and both able to use VOLTE and VOWIFI in Thailand. So i just wait for SEA firmware to release for Xperia 1 II and i flash it over to my Xperia 1 II (HK) last night. This is quite problem the volte button is there but not work, as well noticed that IMS is not registered although it trigger on but greyed out. I think pproblem is with Sony.
Anyhow i recommend to use New Flasher now as it support Xperia 1 II, and i am contributor to the dev since Xz Premium day so the dev is very updated and quick respond and it is simple and easy to use.
Click to expand...
Click to collapse
Hello,
Can you help me? Im using xperia 1 au set convert to customised uk... But volte still didn't work... Try flash customized jp oem still dont work... I wonder if i flashed the wrong oem file... Cam you give the customized jp oem? And how to flashing with the correct way

kuya90 said:
Hello,
Can you help me? Im using xperia 1 au set convert to customised uk... But volte still didn't work... Try flash customized jp oem still dont work... I wonder if i flashed the wrong oem file... Cam you give the customized jp oem? And how to flashing with the correct way
Click to expand...
Click to collapse
normally you just need to flash your country. if you live in uk then flash uk. it used to always work previously, but in xperia 1 iii to make cross flash it wont be always work and you will lose ability to OTA. but if not cross flash and your model is the same model number in your country volte and 5g will work, still OTA is not working anyhow you need to flash update manually everytime

tanipat said:
normally you just need to flash your country. if you live in uk then flash uk. it used to always work previously, but in xperia 1 iii to make cross flash it wont be always work and you will lose ability to OTA. but if not cross flash and your model is the same model number in your country volte and 5g will work, still OTA is not working anyhow you need to flash update manually everytime
Click to expand...
Click to collapse
i dont know which rom in my country used..i just saw a video how to convert to global rom.
done flashing customized uk, and trying to get volte work,after flashing customized jp oem,still volte on my device didnt work.since in my country 3g not working anymore volte very needed..

kuya90 said:
i dont know which rom in my country used..i just saw a video how to convert to global rom.
done flashing customized uk, and trying to get volte work,after flashing customized jp oem,still volte on my device didnt work.since in my country 3g not working anymore volte very needed..
Click to expand...
Click to collapse
my device xperia 1 au set single sim version converted to global customized uk

kuya90 said:
i dont know which rom in my country used..i just saw a video how to convert to global rom.
done flashing customized uk, and trying to get volte work,after flashing customized jp oem,still volte on my device didnt work.since in my country 3g not working anymore volte very needed..
Click to expand...
Click to collapse
If you are flashing the firmware for.your region and volte doesn't work then you won't have much luck flashing different region firmware. However if you want try flashing SEA firmware if it's only compatible with your model

Hazzay88 said:
If you are flashing the firmware for.your region and volte doesn't work then you won't have much luck flashing different region firmware. However if you want try flashing SEA firmware if it's only compatible with your model
Click to expand...
Click to collapse
So, flash using newflasher J8110 customised UK TO J9110 customised SEA?

Softbank Xz3

Hello there
Is there any other user of Xz3 Softbank version? Which firmware are you using?
I tried the Softbank Android 10 and H8416 customized UK 52.1.A.3.92 but I noticed that the battery easily drains.
is this due to NFC? it is completely disabled on H8416 firmware? Should I go back to Android 9 or can I install the dual Sim firmware variant? I noticed guys are saying 672 for h9493. I wonder if this works also with single sim phone like Softbank xz3

I am also xz3 801so user,how did you flash uk firmware?mine bootloader unlock allowed status is no.

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Just flashed H9436 dual sim Firmware via newflashar on 801so it's existing sim showing no sevice....but it got dual sim option,but not useful

irfanbd94 said:
Just flashed H9436 dual sim Firmware via newflashar on 801so it's existing sim showing no sevice....but it got dual sim option,but not useful
Click to expand...
Click to collapse
sorry for the late reply. use H8416 firmware customized UK. that's single sim. ior just stay with japan rom, battery is better than H8416 firmware

engineer0x0000f4 said:
Hello there
Is there any other user of Xz3 Softbank version? Which firmware are you using?
I tried the Softbank Android 10 and H8416 customized UK 52.1.A.3.92 but I noticed that the battery easily drains.
is this due to NFC? it is completely disabled on H8416 firmware? Should I go back to Android 9 or can I install the dual Sim firmware variant? I noticed guys are saying 672 for h9493. I wonder if this works also with single sim phone like Softbank xz3
Click to expand...
Click to collapse
Use customized IT. Or just keep your rom. Search for how to uninstall system app by ADB on android. Remove anything about NFC. You will get better battery.

NFC unavailable to turn on or off from toggle. But it continues running in background. That why your battery drain crazy.

acatoan said:
NFC unavailable to turn on or off from toggle. But it continues running in background. That why your battery drain crazy.
Click to expand...
Click to collapse
just tried this and will see how much it improves

engineer0x0000f4 said:
Hello there
Is there any other user of Xz3 Softbank version? Which firmware are you using?
I tried the Softbank Android 10 and H8416 customized UK 52.1.A.3.92 but I noticed that the battery easily drains.
is this due to NFC? it is completely disabled on H8416 firmware? Should I go back to Android 9 or can I install the dual Sim firmware variant? I noticed guys are saying 672 for h9493. I wonder if this works also with single sim phone like Softbank xz3
Click to expand...
Click to collapse
Did you use Newflasher and Xperifi?
I've installed adb and fastboot, but still not able to install the rom.
Do i need to unlock the bootloader first?
Do you have a tutorial i can follow?

engineer0x0000f4 said:
Hello there
Is there any other user of Xz3 Softbank version? Which firmware are you using?
I tried the Softbank Android 10 and H8416 customized UK 52.1.A.3.92 but I noticed that the battery easily drains.
is this due to NFC? it is completely disabled on H8416 firmware? Should I go back to Android 9 or can I install the dual Sim firmware variant? I noticed guys are saying 672 for h9493. I wonder if this works also with single sim phone like Softbank xz3
Click to expand...
Click to collapse
Yes it is the NFC, you can disable the NFC using adb
Battery life will be normal 1% per hour standby

acatoan said:
Use customized IT. Or just keep your rom. Search for how to uninstall system app by ADB on android. Remove anything about NFC. You will get better battery.
Click to expand...
Click to collapse
Any different between UK or US customized with IT customized? Just curious cause i'm on US customized for now

ekonik3 said:
Any different between UK or US customized with IT customized? Just curious cause i'm on US customized for now
Click to expand...
Click to collapse
No different i think. If you got problem with signal, just try another region rom. Your fingerprint still working on XZ3 running by US rom?

acatoan said:
No different i think. If you got problem with signal, just try another region rom. Your fingerprint still working on XZ3 running by US rom?
Click to expand...
Click to collapse
Yes, my fingerprint stil working... I thought if i change to customized IT i'll have NFC work on my xz3 softbank

ekonik3 said:
Yes, my fingerprint stil working... I thought if i change to customized IT i'll have NFC work on my xz3 softbank
Click to expand...
Click to collapse
It will not work anymore until you back to Japan rom.

acatoan said:
It will not work anymore until you back to Japan rom.
Click to expand...
Click to collapse
I dont know but i use customized US rom for couple weeks and my fingerprint still work.... But NFC not work

ekonik3 said:
I dont know but i use customized US rom for couple weeks and my fingerprint still work.... But NFC not work
Click to expand...
Click to collapse
I mean your NFC, NFC doesn't work if you running on global rom. And it drain your battery 1% per hour until you remove by adb.

acatoan said:
I mean your NFC, NFC doesn't work if you running on global rom. And it drain your battery 1% per hour until you remove by adb.
Click to expand...
Click to collapse
Yes, NFC is not working and i just debloated all NFC related on it in order to safe my battery

ekonik3 said:
Yes, NFC is not working and i just debloated all NFC related on it in order to safe my battery
Click to expand...
Click to collapse
Hi
Umm i'm too late as i received xz3 (AU) couple weeks ago and the battery is going crazy.
Can you please tell me how can i debloat all NFC related stuff and also i'm running uk customized rom android 10(52.1.A.0.618) because of temproot stuff.as i badly need root. Any other suggestions for improving battery life will also be appriciated
Thanks

Sony Xperia XZ3 flashed to Customized DACHBLX misses option "VoLTE"

Yesterday I flashed a used Sony Xperia XZ3 (H9436) from CID 1316-4789 (Customized NOBA) to CID 1316-6961 (Customized DACHBLX) to get VoLTE and VoWiFi selectable.
Because I had seen some error messages in the Newflasher log, I contacted the maintainer Munjeni (see my posting https://forum.xda-developers.com/posts/85701601/), he was able to confirm that the flashing itself was completed without errors.
Unfortunately, I did not quite reach my goal, VoWiFi is now functional, but I still miss the option to select VoLTE.
My SIM card (O2/Telefónica Germany) allows VoLTE in another smartphone, so in my opinion it can only be a firmware issue, am I right?
I would be grateful for a targeted solution suggestion.

Yes

SonyFlasher2021 said:
so in my opinion it can only be a firmware issue, am I right?
yes it is
Click to expand...
Click to collapse

SonyFlasher2021 said:
Yesterday I flashed a used Sony Xperia XZ3 (H9436) from CID 1316-4789 (Customized NOBA) to CID 1316-6961 (Customized DACHBLX) to get VoLTE and VoWiFi selectable.
Because I had seen some error messages in the Newflasher log, I contacted the maintainer Munjeni (see my posting https://forum.xda-developers.com/posts/85701601/), he was able to confirm that the flashing itself was completed without errors.
Unfortunately, I did not quite reach my goal, VoWiFi is now functional, but I still miss the option to select VoLTE.
My SIM card (O2/Telefónica Germany) allows VoLTE in another smartphone, so in my opinion it can only be a firmware issue, am I right?
I would be grateful for a targeted solution suggestion.
Click to expand...
Click to collapse
Sorry to bump an old thread, but have you fixed the issue? I did a full system restore on my xz3 and still haven't gotten VoLTE to work on mine

Sorry for the late reply. No, my efforts to add VoLTE to the Sony Xperia XZ3 (H9436) are paused. I am also waiting for a good tip for a working solution. In the meantime, I'll limit myself to VoWiFi and/or use VoLTE on my second mobile phone, the Sony Xperia XA2 Ultra (H3213).