Vivo Y31 2021 B19 QCN File
Download Vivo Y31 2021 model B19 QCN file from RomWala. Used for repairing null IMEI- baseband unknown- network issues- and RF calibration. Restore using QPST or UMT Tool. Direct link below. Tags: ...
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Vivo Y31 2021 B19 QCN File
| Description | QCN (Qualcomm Calibration Network) file for Vivo Y31 2021 model B19 from RomWala. Used for repairing null IMEI- unknown baseband- network issues- Wi-Fi problems- and restoring RF calibration. Restore using QPST or UMT Tool in DIAG mode. |
| Device Name | Vivo Y31 |
| Brand | Vivo |
| Model | Y31 (2021) |
| Variant | B19 |
| Chipset | Qualcomm Snapdragon 662 SM6115 |
| Chipset Manufacturing Process | 11nm |
| CPU | Octa-core (4x2.0GHz Kryo 260 Gold + 4x1.8GHz Kryo 260 Silver) |
| GPU | Adreno 610 |
| RAM Options | 4GB-6GB LPDDR4X |
| Storage Options | 64GB-128GB UFS 2.1 |
| Expandable Storage | Yes (microSDXC up to 1TB) |
| Battery Capacity | 5000mAh non-removable |
| Charging Support | 18W fast charging |
| Display | 6.58 inches IPS LCD |
| Display Resolution | 1080 x 2408 pixels |
| Display Refresh Rate | 90Hz |
| OS | Funtouch OS 11 based on Android 11 |
| Rear Camera | 48MP + 2MP + 2MP |
| Front Camera | 16MP |
| Fingerprint | Side-mounted |
| Network | 4G LTE Dual SIM |
| What is QCN File | QCN (Qualcomm Calibration Network) is a binary file containing calibration information for device components including radio- Wi-Fi- GPS- IMEI- and network parameters. It stores device-specific RF NV (Non-Volatile) items that ensure proper network connectivity. |
| Important Notes | Note 1: This QCN is for Vivo Y31 2021 B19 variant Note 2: Different from Vivo Y31 (2016) or Y31s models Note 3: Backup original QCN before restoring Note 4: Vivo devices may require authorized service tool for DIAG mode |
| Use Cases | Fix baseband unknown after flashing, Restore null IMEI, Repair network connectivity issues, Fix Wi-Fi and Bluetooth calibration problems, Recover corrupted NV data, Resolve 'No Service' errors |
| Compatible Tools | QPST (Qualcomm Product Support Tools), QFIL, UMT Tool, Octoplus Box, Chimera Tool, UFI Box |
| How to Enable DIAG Mode on Vivo Y31 | Method 1 - Dialer Code: Dial *#558# and navigate to Engineer Mode (may require password) Method 2 - ADB Command: Enable USB Debugging, run: adb shell setprop sys.usb.config diag,adb Method 3 - Professional Box: Use Octoplus/Chimera/UMT Tool to enable DIAG mode Note: DIAG mode on Vivo devices may be restricted; professional tools recommended |
| How to Enter EDL Mode | Step 1: Power off device completely Step 2: Press and hold Volume Up + Volume Down buttons together Step 3: Connect USB cable to PC while holding both buttons Step 4: Screen stays black - device is in EDL mode Step 5: Check Device Manager for Qualcomm HS-USB QDLoader 9008 |
| How to Restore Using QFIL | Step 1: Enable USB Debugging and DIAG mode on device or enter EDL mode Step 2: Open Device Manager - check Qualcomm HS-USB Diagnostics port (9091/9090) or EDL port (9008) Step 3: Launch QFIL as administrator Step 4: Click 'Select Port' and choose the COM port Step 5: Navigate to Tools > QCN Backup/Restore Step 6: Select 'Restore QCN' option Step 7: Browse and select the downloaded .qcn file Step 8: Click 'Restore' button Step 9: Wait for 'Programming Successful' message Step 10: Disconnect device and reboot Step 11: Check IMEI by dialing *#06# |
| How to Restore Using QPST | Step 1: Open QPST Configuration and add COM port Step 2: Open 'Start Clients' > 'Software Download' Step 3: Select 'Restore' tab Step 4: Browse and select QCN file Step 5: Click 'Start' to begin restore Step 6: Wait for completion message Step 7: Restart device |
| How to Write IMEI After QCN Restore (If Needed) | Method 1 - Tool: Use Octoplus/Chimera/UMT Tool to write IMEI Method 2 - QXDM: Use QXDM professional tool for Qualcomm chipsets Note: QCN contains IMEI data; may not need additional write |
| PreRequisites | 70 percent battery, Original USB cable, Qualcomm USB drivers, QPST/QFIL/UMT software, Windows PC, USB Debugging enabled or EDL mode, Backup original QCN before restore |
| Advantages | Restore lost IMEI numbers, Fix baseband unknown after flashing, Repair network connectivity issues, Recover RF calibration data, Fix Wi-Fi and Bluetooth problems |
| Requirements | Qualcomm drivers, QPST/QFIL/UMT Tool, Windows PC, USB cable, DIAG/EDL mode, Backup before restore |
| Warnings | Use on Vivo Y31 2021 B19 only, Not for older Y31 or Y31s models, Restoring incorrect QCN can permanently brick device, Backup original QCN first, IMEI numbers must match device, IMEI modification laws apply, Vivo devices may have security restrictions, All operations at your own risk |
| Troubleshooting | Device not detected - reinstall Qualcomm drivers, DIAG mode not working - try EDL mode, Restore fails - try different USB cable/port, QFIL error - use QPST or UMT instead, IMEI still null - write IMEI manually using tool, Baseband unknown - reflash full firmware first, Vivo security - may need authorized tool |
Vivo Y31 2021 B19 QCN File - Description & Features
Download Vivo Y31 2021 model B19 QCN file from RomWala. Used for repairing null IMEI- baseband unknown- network issues- and RF calibration. Restore using QPST or UMT Tool. Direct link below.
Tags:
#VivoY31 #Y31 #B19 #QCNFile #IMEIRepair #BasebandFix #QPST #UMT #RomWala
Tags:
#VivoY31 #Y31 #B19 #QCNFile #IMEIRepair #BasebandFix #QPST #UMT #RomWala
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