Connect your computer directly to the modem via an Ethernet cable. Do not update via Wi-Fi , as a connection drop can "brick" the device.
(e.g., SY-GPON-1110-WDONT) printed on the label of your device so I can find the specific firmware link for you? syrotech modem firmware update
This method revives 80% of failed update attempts. Connect your computer directly to the modem via
Before downloading any files, you must know your specific hardware details to avoid "bricking" (permanently disabling) the device. Access the Admin Panel syrotech modem firmware update
The Critical Role of Firmware Updates in Syrotech Network Management