To flash the .PAC firmware onto your Nokia TA-1352, you will need specific tools: SPD Flash Tool (ResearchDownload): Download the standard tool for Spreadtrum/Unisoc devices. Unisoc USB Drivers:
Re-install the SPD drivers and try a different USB port or cable.
Users typically search for this specific file for one of two reasons:
You can find a guide and firmware for the Nokia C20 (TA-1352)