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When he plugged it into his PC, the device signature had changed. The firmware version now read: PX10_Global_V1.2.4_MOD .
Ensure your PC has the necessary VCOM or MediaTek drivers installed so it can recognize your powered-off phone.
Browse to your extracted Mobicel PX10 firmware folder, click the matching .pac extension file, and click . Wait a few moments for the tool to fully load the system files.