How To Extract / Unpack IMGs From .PAC Spreadtrum Firmware Package

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Previously, I published an article on how to flash stock firmware on any spreadtrum device, but some people find it difficult flashing the .PAC firmware package contained in the downloaded zip archive. This could be as result of too many reasons: wrong USB driver installation, outdated firmware flashing software, and a handful of other reasons.

In this article, you’ll learn how to extract the important IMG files for flashing via fastboot, just in case flashing with a firmware installation software/program fails to deliver.

Requirements

How To Unpack .pac

Step One: Run Research Download Tool
Step Two: Once it is fully launched, click on the Load Packet icon.
Step Three: In the window that pops up, select the pac file you wish to unpack then click Open

Step Four: Wait for the pac file to load completely, the click the Settings icon
Step Five: Click to highlight any item on the list
Step Six: Now double-click on the highlighted item, right-click and copy the path
Step Seven: Paste the copied path to any text editor, Notepad probably
Step Eight: Open any folder and unhide all hidden items from the Options menu (the steps might vary slightly from the version of your Windows installation)
Step Nine: Navigate to the path in Step Seven above and you’ll find all the files there
Done!
How To Flash via Fastboot
  • Launch fastboot via cmd (remember to download and install fastboot)
  • Copy the partition(s) to flash to your fastboot package directory
  • Reboot device in fastboot mode. Can be done via adb: connect to computer and type

adb reboot bootloader

  •  Once in fastboot mode, use the command below to flash the copied images

fastboot flash boot boot.img

 If you’re flashing recovery image, replace boot and boot.img with recovery and recovery.img.
Done!

Image credits: Hovatek

If you have any questions, suggestions or complaints please ask in comments section.

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11 Comments

  1. In the folder where you have extracted the partitions to, select the exact one(s) you wish to flash via fastboot.

    Right click, then select copy from the options and paste them where your fastboot/adb files are. If you installed adb/fastboot system wide, hold right-click + shift button then select Open Command Window here. Now you can start flashing.

    Click here to learn how to install adb/fastboot system wide.

  2. Bro my device is
    XOLO ERA 4G
    SPREADTRUM SC9830A
    and i backed up my device now i need a tool to convert the backup.zip into pac file,so can you please tell me how to do that and i also have a pac firmware for my device but i have modified my system and need to replace the system.IMG but dont have the correct tool so my humble request to you is to make a detailed tutorial please!!!

    • Hi Shantanu!
      We have taken note of your request, and we will try to make a detailed guide/tutorial on how to compile your Spreadtrum backup into a PAC firmware pretty soon.

    • The files you are supposed to flash when flashing over fastboot include- system.img, boot.img, and recovery.img. These are the most important.

      Indicate the relevant partition in the fastboot command when flashing.

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