[Sony Xperia 1 II Guides, News, & Discussion] sura_tth:
how to

Even with the great contributors' information, I think there are a few areas where I struggle.

For additional information, I will post my success stories.

I'm posting them in machine translation. Please forgive me if it's hard to read.

STEP 1: Implement the Tools You Need

Please install the following tools.

QPST(QPST_2.7.460)

Qualcomm-hs-usb-diagnostics-9091-952454(DIAG driver)

Flashtool (and XperiaFirm)

newflasher(INSTALL is unnecessary, but please get it.)

*All of the above were available on the internet as of 8/15.

STEP2: Get a "modem" that supports VoLTE.

As a prerequisite (regardless of the DualSim/SinglSim model)

For countries that want to use VoLTE, SONY is offering

Official firmware is required.

In my example.

Purchased model: XQ-AT52 (for Hong Kong)

The country where you want to use it: Japan -> SO-51A is available.

(The difference in the number of slots in the SIM doesn't affect it. )

This is the case.

If the firmware to run VoLTE does not exist in the country where you want to use it

This method does not work.

The annotations are long, but here are the steps.

Use XperiFirm, provided by SONY in the country where you want to use VoLTE.

Download the firmware.

STEP3: Use the newflasher to write the firmware from STEP2 to your Xperia 1 ii.

In this case, if you want to burn into a model with a different number of SIM slots

Example: Writing SO-51A firmware to XQ-AT52

→The SIM will not be recognized, but it is temporary.

STEP4: Use EFS Explorer to get the necessary files.

Follow the steps of the great htcmage and have your Xperia 1 ii recognized by EFS Explorer.

4-1: Install the QPST.

4-2:Install Magisk on your Xperia 1 ii.

Therefore, it is mandatory to unlock the bootloader.

4-3:Execute the commands at the command prompt as follows.

adb shell

su

setprop persist.usb.eng 1

Magisk's permission is now required to get SuperUser privileges in su.

Note: From the Magisk menu, go to "# SuperUser" and click on

You can allow.

4-4: The debug mode is disconnected, so you need to re-enable it.

4-5: If you have installed the qualcomm-hs-usb-diagnostics-9091-952454 (DIAG driver), you can use

It is recognized by EFS Explorer.

4-6: On the Phone Selectio screen, Banner selects the ROW port.

STEP 5: Back up the files required for VoLTE activation.

Before following the steps below, you must have the SIM of the line/carrier you want to enable VoLTE on.

Please plug in.

I have backed up the following folders.

There may be some things you don't need, but at least it works.

Data_Profiles

efsprofiles

Ims.

nv/item_files/datamodem

nv/item_files/ims

nv/item_files/mcfg

nv/item_files/modem

STEP6: Write the firmware you want to use, and copy the file from STEP5 to

Override.

Follow steps 3 to 4 of STEP 3 to 4 to get the firmware you want to use.

Write & make EFS Explorer recognize it. (Don't remove the SIM.)

Then, overwrite it with the files backed up in STEP 5.

You should probably now have VoLTE available.

Thanks to the person who walked me through the Magisk installation process, and to the great htcmage.

Also, I pray that others wandering in the same sea of information will be saved.