There are multiple revisions of the HG680P (e.g., HG680P_MCU vs. HG680P_AC ). open the box (4 rubber feet screws) and check the PCB version before flashing. Flashing the wrong .dtb file will brick your device.

: Frequently configured alongside OpenWrt on external storage to facilitate tasks like auto-login for Wi-Fi or "injecting" data quotas. Installation Overview