Plug the phone into a USB 2.0 port (USB 3.0 can sometimes cause connection dropouts).
What do you see when dialing *#06# right now?
There are two primary ways to approach this: Software-based repair (easier) and Hardware-based modification for persistent IMEI issues (hardcore). Method 1: Software Repair via Diag Mode (UMT/QFIL)
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Note: If you have a valid backup file (e.g., modemst1.img ), replace /dev/zero with the path to your backup file to write the original data back to the partition.
Before proceeding with any repair, it is crucial to understand the legal boundaries regarding IMEI manipulation.
Open the UMT tool and select the Qualcomm tab. Plug the phone into a USB 2
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The correct firmware for your specific Poco X3 NFC variant (ensure you download the correct region: Global, EEA, India, etc.). An unlocked bootloader. Step-by-Step Procedure
Before attempting any repairs, ensure your phone is prepared. If the device cannot boot, these steps may be difficult, but are necessary: Absolutely required. Custom Recovery (TWRP/OrangeFox): Installed on your device. USB Drivers: Installed on your computer. ADB & Fastboot Tools: Installed on your computer. Method 1: Software Repair via Diag Mode (UMT/QFIL)
Professional tools often require a paid license or subscription and are best suited for technicians who perform repairs regularly.
Enter your original 15-digit IMEI into the software to inject it into the file, then save the modified QCN.