Redmi K50 Gaming / Poco F4 GT (ingres) QCN network fix

Quick, safe steps to back up and restore the ingres QCN for Redmi K50 Gaming / Poco F4 GT to resolve “No Service/Unknown Baseband” without altering IMEI.

What is QCN on ingres?

QCN holds Qualcomm NV/RF items for ingres (calibration, band configs, IMS toggles). It is device-specific. Restoring your own backup can fix No Service, but importing someone else’s QCN can break radio and is illegal if it alters identifiers.

Before you start on ingres

• Install Qualcomm drivers (HS-USB Diagnostics appears in Device Manager when Diag is enabled).
• Tools: QPST (incl. QPST Configuration & Software Download) or QFIL.
• Battery ≥50%, original USB cable.
• Legal & safety: Never modify or rewrite IMEI/MEID. Only use your own QCN backup.

Back up QCN on ingres (when the phone still works)

1. Enable Diag port (developer/engineer method or ADB if permitted): connect USB and ensure a “Qualcomm HS-USB Diagnostics” COM port is visible.
2. Open QPST Configuration → add the COM port → Software Download → Backup tab → Browse → save ingres_mybackup.qcn.
3. Keep this file safe; it’s tied to your unit’s calibration.

Restore QCN on ingres (network fix)

1. Boot the phone and enable the Diag port again; confirm the Diagnostics COM port.
2. QPST → Software Download → Restore tab → select your ingres_mybackup.qcn.
3. Start restore → wait for “Download Succeeded” → reboot the phone.
4. After boot: verify Baseband version, SIM detection, LTE/5G attach, VoLTE/IMS registration.

Common causes on ingres & quick checks

• Modem mismatch: Use firmware/region whose modem matches your build.
• Persist/modemst corruption: If baseband is “Unknown,” reflash full firmware (clean) before QCN restore.
• Bands disabled: Use a Qualcomm NV viewer only to read and confirm bands; avoid writing random items.
• Hardware: Inspect antenna/spring contacts if drops or repairs preceded the issue.

Legal & safety notes for ingres

• QCN restore is for repairing your own device’s calibration only.
• Do not share or import QCNs from other devices.
• Altering IMEI/identifiers is illegal in many countries and can permanently block network access.

Download

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