Later firmware (2023, 2024) added “security enhancements” that locked down the bootloader and removed the telnet vector. They also introduced (remote ISP management) that cannot be disabled, even with admin credentials.

⚠️ : Incorrect firmware can brick your router. Only use files provided by your ISP or ZTE directly for your exact hardware model (check H2640, H2640V9, or H2640L).

There have been reports of injected backdoors.

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