📌 Qualcomm EFS Security File – Complete Practical Guide

✅ Qualcomm devices ki EFS (Encrypted File System) security file ka backup lena, restore karna, aur fix karna bohot zaroori hai, kyunki ye phone ke IMEI, network, aur security settings ko protect karti hai. Agar EFS corrupt ho jaye to phone “No Service”, “IMEI Null” ya “Baseband Unknown” error show kar sakta hai.

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🔹 Step 1: EFS File Ka Backup Lena (Recommended Before Flashing)

Agar aap Qualcomm phone ko flash ya repair karne wale hain, to pehle EFS ka backup lena bohot zaroori hai.

✅ Method 1: Using QPST Tool (Qualcomm Phones)

Requirements:
🔹 ADB & Fastboot Installed
🔹 QPST Tool Installed
🔹 USB Debugging Enabled

📌 Process:

1. Phone ko Diagnostic Mode (Diag Mode) me dalen:
   • Dial *#*#717717#*#* (Har phone me ye code kaam nahi karega).
   • Ya phir ADB command use karein: adb shell su setprop sys.usb.config diag,adb
   • Ya QPST/QFIL Mode se direct connect karein.
2. QPST Software Start karein aur “Software Download” Option Open Karein.
3. Backup Tab me “Start” Button dabayen, aur EFS file save karlein.

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🔹 Step 2: EFS File Restore Karna (Agar IMEI Null Ho Jaye)

Agar phone ka IMEI null ho gaya ho ya baseband unknown error aa raha ho, to EFS file restore karni padegi.

✅ Method 1: QPST Tool Se Restore

1. Phone ko Diag Mode me dalen (Step 1 me bataya gaya hai).
2. QPST Tool me Software Download section open karein.
3. “Restore” ka option select karein, aur jo backup save kiya tha wo file select karein.
4. Start Button dabayen, aur jab process complete ho jaye to phone restart karein.

✅ Method 2: ADB Commands Ke Zariye

Agar QPST kaam na kare to ADB commands se manually restore karein:

adb shell
su
dd if=/sdcard/EFS.img of=/dev/block/bootdevice/by-name/modemst1
dd if=/sdcard/EFS.img of=/dev/block/bootdevice/by-name/modemst2
reboot

Isse phone ka IMEI wapas aane ke chances hain.

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🔹 Step 3: Agar EFS File Missing Ho Ya Corrupt Ho

Agar backup available nahi hai aur EFS corrupt ho gayi hai, to ye steps follow karein:

✅ Solution 1: Default QCN File Flash Karein

1. Apne phone ka exact model ka QCN file download karein.
2. QPST/QFIL Tool se restore karein.
3. IMEI Write Tool ka use karein agar IMEI bhi missing ho.

✅ Solution 2: Engineer Mode Se Fix Karein

1. Phone ko root karein.
2. MTK Engineering Mode ya Qualcomm Diag Mode ka use karein.
3. AT Commands se IMEI wapas likhein: AT+EGMR=1,7,"IMEI-NUMBER"

✅ Solution 3: Professional Tools Use Karein
Agar above methods kaam na karein to professional tools jaise ke UMT, Octoplus, Chimera Tool ya MRT ka use karein.

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📌 Conclusion

✔️ Agar aap Qualcomm phone ko flash ya unlock kar rahe hain, to EFS ka backup lena bohot zaroori hai, warna phone ka network aur IMEI chale ja sakte hain.
✔️ QPST ya ADB ka use karke EFS ko backup aur restore kiya ja sakta hai.
✔️ Agar EFS corrupt ho jaye to QCN file ya IMEI repair tools ka use karein.

Agar kisi specific Qualcomm model ka solution chahiye to bata sakte hain! 😊