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A: Extremely unlikely. The efuse system is designed to be irreversible. The only theoretical method would require a hypervisor-level exploit that also defeats Syscon verification—no such exploit exists publicly.
The answer: Why? Because the Syscon chip and the NOR flash store incremental version counters. Restoring an old NAND backup does not reset the Syscon. The moment you power on, the Syscon says: "I’ve seen firmware 10.00 before. You’re trying to boot 5.05. Go to safe mode." And in safe mode, Sony forces you to install the latest firmware.