Open your phone's stock dialer app and type manufacturer-specific codes, such as *#*#717717#*#* (for Xiaomi/Poco) or *#801# (for Oppo/Realme).
You also need to enable on your smartphone. This special USB mode allows low-level software like the QCN tool to directly access the phone's internal modem and NVRAM (Non-Volatile Random Access Memory). The exact method to enable this mode varies by phone model, often involving dialer codes (e.g., *#0808# ) or ADB commands. Tungtata QCN Tool.zip
You can typically find the file hosted on community forums or direct links like this Google Drive host. Open your phone's stock dialer app and type
Try changing the USB port (preferably use a rear USB 2.0 port on desktops) and swap out the USB cable. Important Safety and Legal Notice The exact method to enable this mode varies
Safely modifies the QCN file to write the original, legal hardware identifiers (IMEI 1 and IMEI 2) back to the device.
This can happen if the diagnostic port is not correctly enabled or if the correct drivers are not installed. First, ensure that your device manager correctly recognizes the phone. Also, try running the tool as an administrator.