Huawei Y7 Prime QCN File _ LDN-LX2 Fix No Service IMEI Repair _ Tested QCN File

Huawei Y7 Prime QCN File Many people were satisfied with the Huawei Y7 Prime (LDN-LX2) as it was a dependable device that offered good performance and battery life. However, an annoying and frustrating problem that can cause the loss of network signal on this gadget and a number of other Android phones, thus a “No Service” message is frequently shown all the time, might be followed by invalid or null IMEI. In a situation when switching off/on, SIM card reinstallation, and resetting network settings do not help, the problem is a corrupted QCN file. The article explains what a QCN file is, why it is important for your Y7 Prime, and how using a tested file for the LDN-LX2 model is the ultimate way.

Understanding the Core of the Problem: Huawei Y7 Prime QCN File

Knowing the solution requires understanding the problem first. QCN means Qualcomm Calibration Data. It is a very important file that is saved on the modem partition of phones with chipsets made by Qualcomm, e.g. the Huawei Y7 Prime has a Snapdragon processor. This file is not an OS or user data; it is hardware calibration data for the device.

The QCN file is the one that has to do with very close communication between your handset and cellular networks. The most important details in it are:

IMEI (International Mobile Equipment Identity): The 15-digit unique number by which the cellular network identifies, authenticates, and communicates with the device. If the network finds that IMEI is not valid, it will not permit the use of the device.

Baseband Calibration: These settings are related to your device’s radio frequency (RF) hardware (antenna, receiver, amplifier, etc.), so that it can work properly with 2G, 3G as well as 4LTE bands.

Wi-Fi and Bluetooth MAC Addresses: The non-changeable identifiers for the wireless standards your device supports.

How Can the QCN File Be Corrupted?

What situations could have caused the deletion or corruption of QCN file that resulted in “No Service” and IMEI problems to appear?

Broken-up or Interrupted Firmware Update: The update or flashing process that is interrupted or performed incorrectly can result in the accidental overwriting and/or damage of the modem partition.

Factory Reset or EMMC Issues: Less frequent examples are the cases when a factory reset or storage (EMMC) problems lead to the corruption of this sensitive area.

Software Glitches or Malware: However, software side severe infection or corruption can sometimes target the modem software.

In this case, the phone’s hardware has not been affected, but its ‘network identity’ has disappeared. Therefore, the next step should be to recover a tested QCN ​‍​‌‍​‍‌​‍​‌‍​‍‌file.

The​‍​‌‍​‍‌​‍​‌‍​‍‌ Solution: Using a Tested QCN File for LDN-LX2

A QCN file that has been tested for the Huawei Y7 Prime (LDN-LX2) is essentially a good backup of the calibration data. When the file is flashed to your device, it is similar to giving it a new identity in the network world.

Why a “Tested” File Is Crucial?

random, unverified QCN files  found on  internet hardly  help in fixing problem. An incorrect QCN file might cause the following situations:

Network problems that will not go away even after restarting.

Radio calibration issues that may cause your device to overheat or battery drain.

A phone that has no signal at all and cannot make any calls or send messages.

Knowing correct hardware and network bands of the device, a “tested” file for LDN-LX2 model most probably has 100% compatibility and hence restoration success rate.

How to Recover Your QCN File Step-by-Step

Warning: The operations involved are complicated and risky, such as, if done improperly, it can result in device bricking. Be cautious and carry out the task only if you are sure of your skills. Prior to performing the operation, always make a backup of your data.

Required:

A computer running Windows OS.

USB cable that can transfer data.

QPST Tool: The Qualcomm package to ‘flash’ QCN file.

Huawei Y7 Prime (LDN-LX2) Drivers: sure set machine.

A trustworthy source for the tested LDN-LX2 QCN file.

DIAG mode activated:  diagnostic port  phone needs  unlocked.

Steps:

Get into DIAG mode: different methods are possible. For example, typing *#*#2846579#*#* on the Huawei dialer normally brings up the “ProjectMenu.” Then, from “Background Settings,” go to “USB Port Settings,” and pick “Manufacture Mode.” Moreover, to gain access to the port, some instruction sheets refer to pressing a certain key combination while another one suggests using the “Huawei Modem Unlocker” software.

Set up and QPST Install: First, on your PC install the QPST program. Launch “QPST Configuration.” It is your phone connected in DIAG mode that will be spotted by QPST among the ports listed and you thus don’t need to manually add a port. If the connection is not detected, you may locate the port check via device manager (it is usually under “Ports(COM & LPT)” where you will find a “Qualcomm HS-USB QDLoader” or the like name), then add it by yourself.

Make an image (if you can): Before you overwrite with the new data, it’s best to try and locate the current QCN from your mobile by means of the “QCN Backup” option in the “Software Download” panel of the tool you’re using, in this case, QFIL.  you have a copy even turns out corrupted one.

Use QPST to Operate QCN: On QPST Configuration interface, locate and highlight your mobile phone COM port; then click “Client Starter” > “EFS Explorer”.

Alternatively, the user may initiate the operation through a locally-installed “QCN Backup Restore” tool within the QPST suite.

Ensure that you have the right COM link for your unit.

Press “Restore” and select the location where locally you have saved the tested LDN-LX2_QCN_FILE.qcn file.

It will write data to your cellular phone’s modem so leave it alone for a short time.

Reboot and Verify:

After finishing (you will get a message saying “Restore Passed” or similar),” unplug your handset.

Restart it forcibly by keeping the Power button pressed for about 10-15 seconds.

After the restart, dial *#06# to view your IMEI. The digits stored in the donor QCN file should be the ones that you see now.

Put in a SIM card. Instead “No Service” message, network operator’s name displayed, and you able to make calls and use mobile ​‍​‌‍​‍‌​‍​‌‍​‍‌Internet.

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