A: In the US and EU, downgrading firmware to use third‑party toner is generally legal under right‑to‑repair and antitrust laws. However, it may void your warranty (which is likely expired anyway).

A: The printer is in a corrupted state. Use the emergency recovery method in Part 7.

Is your Samsung printer refusing to accept third-party toner? Stuck in a “Replace Toner” loop despite a full cartridge? Frozen on an error code?

If you own a legacy Samsung monochrome laser printer—specifically the ML-2160, ML-2165, ML-2160W, or ML-2165W—you have likely encountered a frustrating reality: firmware updates designed to block compatible or refilled toner cartridges. The solution isn’t buying a new printer. It is performing a or downgrade .