The Rebuilder tool does not usually flash the file itself. It relies on the industry-standard , specifically the QFIL or EFS Explorer components.

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Advanced versions of the tool support repairing IMEIs for both SIM slots on dual-SIM devices.

The “Qualcomm IMEI Rebuilder” refers to software that can reconstruct or modify the International Mobile Equipment Identity (IMEI) stored in Qualcomm‑based baseband chips. The IMEI is a 15‑digit identifier used by cellular networks to recognize a device. Because the IMEI is stored in non‑volatile memory (NV) of the modem, specialized tools are required to read, edit, or rebuild it.