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The Qualcomm SIM lock unlock tool works by communicating directly with the Qualcomm chipset in a mobile device. It uses a combination of software commands and interaction with the device's bootloader to modify or remove the SIM lock. The process generally involves:
, which is the Google account lock that appears after a factory reset without logging out. User Lock Removal
The tool connects but fails to read or write NV items, often with an “access denied” message.