. Firmware for these units is typically carrier-locked or region-specific. High Quality FTTH English version for GM220S
Look for OMCI V9 or higher for the best stability with modern ISP equipment. firmware gm220s top
Because this device is usually provided by an ISP, the firmware installed on it is rarely "vanilla" manufacturer software. It is almost always customized to meet the specific needs of the Internet Service Provider. firmware gm220s top