Question Can't register VOLTE after Indonesian ROM switch - Redmi Note 11 Pro+ 5G (peux)/POCO X4 Pro 5G (veux)

I installed stock indonesian rom on global redmi note 11 pro (MIUI 13 on Android 12). I enabled both VoWIFI and VoLTE switches. They are shown in sim tab and they are both active. But if I call *#*#4636#*#* I read IMS not registerd and call with LTE not available.
Then I tried *#*#663368378#*#* to access Modem test tools but I can't access. I installed also MIUI Hidden Settings but it say Modem test tools is not available. I need to access to MBN Check to modify SW MBN and switch to mbn_eea (I live in Italy) but I can't without Modem test tools.
Any help?

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Use a Custom ROM

Found MBN files. So, can we activate volte or vowifi soelly using mbn files ?

Ive stopped trying qpst method for now because pdc will not recognize my phone no matter what. It gives me qim error please use usb 1.0.37 or later error no matter the drivers i use
I am wondering if we can do something like this
https://www.reddit.com/r/GooglePixel/comments/7n8pes/enable_volte_trhough_modem_mod_nv_items/
as I did this with pixel and it helped unlock volte and wifi sms /mms(wasnt able to get vowifi)
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vendor\rfs\msm\mpss\readonly\vendor\mbn\mcfg_sw\

Enable VoWiFi for unsupported carriers

Hi,
I am from Poland. T-mobile and Play did not support this model.
I am wondering if there is possible to enable this option.
Hi! You can try this way - https://forum.xda-developers.com/t/one-way-to-enable-volte-on-pixel4a-5g.4207725/
But will need to probably find proper mbn file for your SOC.

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