Features fully unlocked menus, manual band locking, and unrestricted VoIP/VoLTE settings.
If your carrier no longer pushes 2021 updates (they may be on 2022 or 2023 builds), you might find a update.zip file on unofficial forums (use at your own risk).
Log in using the admin password found on the sticker underneath your router.
Many 2021 carrier versions just hide the menu elements in HTML. You can unhide them: zte mc801a firmware 2021
Security assessments and technical whitepapers in 2021 focused on the vulnerabilities within the MC801A firmware: Unauthenticated API Exposure : Research documented by LinkedIn security experts and referenced in 2021 Cisco Talos reports
Fixes drops during switches between 4G and 5G.
Whether you are looking to optimize your current connection, troubleshoot a stable build, or explore advanced modding, understanding the 2021 firmware ecosystem is essential. Why the 2021 Firmware Architecture Matters Features fully unlocked menus, manual band locking, and
Using older firmware means missing out on the latest security patches against modern web exploits. How to Check Your Current Version
Many users look for 2021 firmware files to "downgrade" their routers or to de-brand a device locked to a specific carrier. While this can unlock features, it carries significant risks:
Log in using your admin password (found on the bottom device sticker). Many 2021 carrier versions just hide the menu
: Refined 802.11ax performance on both 2.4GHz and 5GHz bands, supporting up to 30 (or in some regions 128) simultaneous devices with better throughput.
The ZTE MC801A firmware in 2021 was , primarily due to rushed 5G NSA integration, poor thermal management, and several security gaps. While build B06 offered marginal improvements, the device did not reach an acceptable stability level until mid-2022 firmware updates (post B10 ). For any user still operating a 2021-era firmware on an MC801A, an upgrade is strongly advised.