Mi A1 VoLTE and VoWifi Codec problems/Change MBN in PDC - Xiaomi Mi A1 Questions & Answers

Hi all,
I managed to get VoLTE working on the latest stock rom making some changes to the build.prop. Unfortunately it has problems negotiating the correct codec with my carrier O2/Telefonica Germany, so the caller sounds like a robot. (see https://hilfe.o2online.de/mobilfunk...te-mit-xiaomi-a1-seit-dem-4-9-gestoert-543567 )This only happens for some calls, depending on the counterpart device.
I tried changing the modem profile with Qualcomm's PDC tool. Using VoLTE_CU I can properly use VoLTE with my carrier:
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Unfortunately this disables VoWifi for me. I've had another look and many people uploaded their .mbn modem profiles for Telefonica Germany. How can I inject this using PDC? When clicking "Load", I can select the .mbn but it won't appear in the list.
Thanks
Giegl

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LTE, GSM and Bootloader

Hi.
As the title says I am searching for a bundle.
For this:
http://www.sammobile.com/firmwares/d...05VIAHOE1_VIA/
The phones carrier is 1&1 but I flashed CM and the branding is gone.
Now I am using the O2 net, so is it better to use LTE, GSM and Bootloader I posted or this one
for 1&1?
http://www.sammobile.com/firmwares/d...05XEGHOB1_XEG/
Edit: As mentioned it is better to use different packages and figure out which one runs smoothly.
So can anyone provide me the LTE, GSM and BL
matching the first link I've posted please?
Hello PePeMoke,
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If you want, you can write me a PM in German

Unable to run USSD codes?

Hi, recently I flashed/updated via Odin (all the files including CSC, not the Home_CSCS) my phone (S7 edge G935f) with the latest Germany Vodafone firmware (QD2), previously my phone was DBT. Now I encountered the following "problems". I am not able to run any USSD codes and my imei registration status says "Not registered". The device doesn't seem to behave weird, I have carrier signal and full LTE speed.
Will I be able to receive OTA updates in the future?
Did I do anything wrong?
Any information is welcomed.
*I don't know how to add pictures to the thread so I'm trying*
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How to switch carrier configuration?

I have a problem. I use stock XEO ROM (unbranded firmware for Poland) and all my carrier features like WiFi Calling or VoLTE were working correctly (Service Provider SW version in About Phone said back then that CSC is XEO/XEO/OMN - my phone is from Italy, that's why the last bit is different).
I visited Russia recently and got a local SIM there. After using it my configuration changed and now back home carrier features stopped working, CSC in About Phone changed to XEO/SER/OMN.
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Samsung Galaxy S10+ (SM-G975F - Exynos) VoLTE & WiFi Calling

Looking for some help enabling VoLTE on my S10+.
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Choose Network button disabled and unable to detect network after flashing custom rom

I flashed PE12 custom rom in Mi A1. After flashing, my mobile network stops working. Choose Network button under Mobile Networks is disabled. I changed the sim and flashed another rom , the issue is same.
Sim network is detecting correctly as Jio 4G and number too. Please see the images below. How to make this work?
Note: IMEI numbers are showing correctly.
Thanks in advance
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