Vivo X9 PD1616 Firmware Flash File | Solve Invalid IMEI with QCN File

Vivo X9 PD1616 Firmware Flash File – Solve No Signal / No SIM Issue

Flashing your Vivo X9 PD1616 may fix boot issues, but many users report that after flashing, their device shows No Signal or fails to detect SIM card. This problem is common when the modem/NV partitions are skipped or corrupted during the flash process.

Common Issues After Flashing Vivo X9:

• No Network Signal or "Emergency Calls Only"
• SIM Not Detected / No Service After Flash
• IMEI 0 or Null After Firmware Update

Root Cause of No Network Problem:

This issue typically occurs when:

• The firmware flash misses the modem.img or NON-HLOS.bin file
• QCN (Qualcomm Calibration File) is not restored
• EFS partition or NVRAM data is corrupted or erased

Important: Before flashing, always backup your QCN and EFS. After flashing, restore QCN using QPST to fix signal issues.

Files Required:

Vivo X9 PD1616 Flash Tools & Firmware

Download Vivo X9 PD1616 Firmware (PD1616_D_1.23.14)

QPST/QFIL Tool for Flashing

Qualcomm USB Drivers

How to Flash Vivo X9 PD1616 Stock ROM

1. Install QPST Tool and Qualcomm Drivers on your PC
2. Extract the firmware using 7zip or WinRAR
3. Open QFIL Tool > Select Flat Build
4. Browse to prog_emmc_firehose_8937.mbn file inside firmware folder
5. Click "Load XML" and select rawprogram0.xml and patch0.xml
6. Switch phone to EDL mode via test point or ADB
7. Connect the phone to PC, check if detected as Qualcomm 9008 port
8. Click “Download” to start flashing

How to Fix No Signal After Flash

1. Restore your backed-up QCN file using QPST
2. If IMEI is null, use QCN Writer or QFIL’s IMEI Restore feature
3. Dial *#06# to verify IMEI after fix
4. Factory reset after IMEI restore to reload network drivers

Note: If you did not backup QCN, you can try a universal QCN of the same model. Only use it if baseband version matches.

Need Help?

Still facing No Signal or Network Not Working after flash? Comment your problem or visit Firmware4Mobile and search for your exact model QCN file and signal repair tutorial.

Tags: Vivo X9 No Network After Flash, Signal Lost Fix, QCN Restore, Vivo PD1616 Flashing Error, Qualcomm MSM8953