1. Obtain the usb_single.bin file from a technical support engineer.
2. Format a USB drive to FAT32.
3. Place the bin file in the root directory.
4. Power off the F680.
5. Insert the USB drive.
6. Hold the Reset button (pin-hole) while powering on.
7. Release reset after 10 seconds. The LED should flash indicating a recovery flash.

"ZTE F680 firmware upgrade,"

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: Updates resolve common software bugs that cause unexpected reboots, freezes, or Wi-Fi disconnections. Alibaba.com How to Upgrade the ZTE F680 Obtain the usb_single