Installing a .pac firmware file on the Nokia C1 (TA-1165) is a standard procedure for devices using the Spreadtrum (Unisoc) chipset. This process is typically used to fix software issues, remove screen locks, or unbrick the device. Prerequisites Before you begin, ensure you have the following:
The TA1165 comes in v1A, v2B, and v3C revisions. Using the wrong PAC file will cause a “Signature Mismatch” error.
Extract Files: Unzip both the SPD Upgrade Tool and the firmware PAC file on your computer.
Configure Flashing Settings: Click the "Settings" (double gear icon) to ensure the correct partitions are selected. Usually, the default settings are sufficient for a standard flash. Connect the Device: Power off your Nokia TA-1165 completely.