Some carriers have better, less congested 3G networks than others.
Advanced users can attempt manual unlocking using specific codes:
Streaming HD, video calls, and large downloads are possible.
Therefore, the concept of a "free 4G upgrade" by simply updating the software is a myth for owners of the standard 3G ZTE MF65.
While you cannot upgrade the hardware generation, you can update the official 3G firmware to improve stability. Benefits of Official Updates Better battery management. Fixed bugs and fewer connection drops. Improved security against local hacking attempts. Better compatibility with newer SIM cards. How to Check for Real Updates Connect your computer to the ZTE MF65 Wi-Fi network.
The ZTE MF65 is designed as a mobile hotspot with a maximum download speed of 21.6 Mbps . Because 4G LTE requires different physical internal components (antennas and chipsets), no "free upgrade" software can enable 4G connectivity on this specific model. Some carrier-branded versions may display a "4G" icon in their dashboard, but this often refers to HSPA+ (3.5G) rather than true LTE. How to Update Your ZTE MF65 Firmware
To understand why an upgrade is impossible, one must first understand the hardware limitations of the device in question.
To understand the impact, here’s a comparison of theoretical speeds:
Put a different network's SIM card into the device, power it on, access the web management page (usually 192.168.0.1 ), and enter the unlock code when prompted. Best Budget Alternatives for True 4G Connectivity
Here's what a modern upgrade offers: