If you have Xiaomi Global Version 14 use this fix.
Mobile sees the SIM but you have no signal?nal? Download this package: houji_network_fix install in fastboot: 1. Unzip the ZIP file on the PC 2. Connect the mobile phone in fastboot mode to the PC 3. Run the installation with the windows_install_fix.bat script 4. wait for the mobile to reboot...
xiaomi.eu
If you have a Chinese device, just install the xiaomi.eu ROM
The Chinese device does not support eSIM