In 2021, the security of ZTE firmware was a significant focus for cybersecurity researchers. A notable vulnerability, CVE-2021-21748
| ISP / Region | How to get 2021 firmware | File name example | | :--- | :--- | :--- | | | Auto-pushed via WAN. Cannot manual flash. Call support for forced push. | H2640_Optimum_v2.1.0_2021 | | Vodafone (EU) | Download from Vodafone Community portal (login required). | VDF_H2640_21.3.1.bin | | Generic Retail | Extremely rare. Contact ZTE support with SN#. | ZXHN_H2640_V1.0.8_2021 | zte h2640 firmware 2021