The PAC file is a specific firmware format used for devices powered by Spreadtrum (SPD) or Unisoc processors. Since the Nokia TA-1304 runs on a specialized chipset compatible with these tools, the PAC file contains the entire operating system, bootloader, and system recovery data required to "re-flash" the phone.
Nokia TA-1304 Flash File PAC File: Download and Installation Guide nokia ta1304 flash file pac file
SPD Upgrade Tool (Research Download Tool): This is the utility used to push the PAC file from your PC to the phone. Step 2: Install the USB Drivers Extract the downloaded USB Driver package. Run the setup file and follow the on-screen instructions. The PAC file is a specific firmware format