S-TELL C551 Official Stock Firmware Flash Files

How To Update/Unbrick S-TELL C551 Official Stock Firmware Flash Files With Research Download Tool


S-TELL C551 Official Stock Firmware Flash Files

You Can Use The Following Method For Upgrade S-TELL C551 Android 6.0/ And If You Want To Hard Reset It By Flashing The Stock Rom/ In Case If You Are Using Any Custom Rom And Want Back To Stock Rom And Official Firmware Or Facing The Boot Loop Problem. This Method Is Also Useful For Sudden Death/Bricked/Not Power And Also After Flashing The Stock Rom IMEI Null or Unknown Baseband Problems Can Be Solve.


How to Use Research Download Tool / Upgrade Download Tool

1. Open the Research download tool > bin folder

2. Launch ResearchDownload.exe

3. Click on the Load Packet icon (top left corner)

4. In the window that pops up, navigate to the location of the .pac file, select it then click Open

5. The PAC file should now be loaded (its name should appear at the top)

6. Click the Settings Icon (top left corner).

7. In the box that pops up, untick any item(s) you do not wish to flash then click OK. Ignore this step if you wish to flash all files.

8. Click the Start downloading button.

9. You should see Waiting…. under the Progress bar.

10. Switch off the phone (still with battery inside) then connect it to the PC via USB cord (note that you might need to hold the volume decrease button while connecting to PC on some phones) and flashing should begin. DO NOT interrupt.

11. Once flashing is complete, you’ll see Passed.

12. Click on the Stop downloading icon then disconnect the phone from PC and boot.

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