To write the EFS/QCN file, the phone must be in a mode where the PC can talk to the modem.
That said, here are sources for clean/blank QCN files for Redmi Note 11 4G (spes/spesn): redmi note 11 464 4g xqcn qcn efs file hot free do
A partition that stores device-specific data, including the IMEI and baseband info. If this is corrupted, your phone may show "Emergency Calls Only". To write the EFS/QCN file, the phone must