VOLTE Success, Activation without Firmware Replacement (Sony Mobile withdrawal area)

I wrote the method in 1 II for your reference.
The Qualcomm Diagnostic Port command in Xperia 1 is as follows.
(setprop sys.usb.config rndis,eng_mode,adb)
And use the EFSTOols.exe program.
It's easier than I mk2.
Screenshot is
1 and 1 MK2

Hello Xperia users! In the meantime, I finally solved the VOLTE problem! I approached Qualcomm's diagnostic port-active-efsExplorer and solved the problem by inserting a VOLTE profile from my carrier
Sorry, this is Korea and I am Korean.
However, I will...

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