XZP VoLTE firmware

chris_j26

Senior Member
Apr 26, 2017
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oem.sin only includes instructions which configuration(.mbn) to load.
all configuration are universally available in system.sin
I've edited the modem.conf(in /OEM/modem-config/) file for my X performance and changed it to the name of my operator but I have not noticed any changes in volte. Is this how I change it or do I need to reload something? Is there a way to get the software information ( like the screenshot posted earlier) and find out whether just doing that changed my modem?


UPDATE: Checked the software info and it's still on the old modem despite changing the modem.conf file. Is there a way to force it to change without the customisation selector (modem switcher) tool that people have managed to get working on the Z5?

UPDATE 2: reflashed phone via Flashtool and excluded oem partition from being flashed and now have working VoLTE
 
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SGH-i200

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Aug 31, 2009
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I've edited the modem.conf(in /OEM/modem-config/) file
I add your good step-by-step instruction here for rooted devices:
I have finally been able to get VoLTE working on my [Sony Xperia] despite my carrier never having 'supported' my handset (they never sold it here).

1) First using a root file browser to look into /system/etc/customisations/modem/
2) Check to see if there is any reference to your operator's modem in your model firmware. They are all in the format of amss_fsg_poplar_xxx_tar.mbn
3) Once you have a spotted your operator you need to take note of what's in between 'poplar_' and '_tar' so for example if I use china mobile - I would find amss_fsg_poplar_china_mobile_hk_ims_tar.mbn I would need to take note of china_mobile_hk_ims
4) Once you have this you need to connect your phone via ADB to your PC (I found this much easier on a computer).
5) Enter the following commands adb root then adb shell
6) mount -o rw,remount /oem
7) vi /oem/modem-config/modem.conf
8) press 'i' on your keyboard to enter edit mode and delete whatever is in the file and replace it with your operator modem from step 3 - (china_mobile_hk_ims in this example) then press 'ESC' and then ':wq'
12) Once you have completed reboot your phone and you should pickup VoLTE settings at setup.

[...] Theoretically should work for any Xperia phones with an OEM partition, however each phone might have a different modem name for the same operator ( I know this to be the case between the XZP and the XXP), however if you get the bit in between 'modelname_' and '_tar' and follow the same process for editing the modem.conf file you should get the same results.
 

Raffsa

New member
Jan 6, 2018
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I uploaded the soft Orange with G8142 and VoLTE and Wiffi Calling to the non-branded G8142, only what I have a problem with MMS I tried different settings, restore etc. and nothing.
 
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